The UDRP limits parties’ submissions to complaints and responses;  accepting "further statements or documents" is discretionary with the  Panel (Rule 12, Procedural Orders), although the Forum (in Supplemental  Rule 7) but not WIPO provides for supplementing the record with the  proviso that “[a]dditional submissions must not amend the Complaint or  Response.” For some panelists, Rule 7 contradicts the Policy. A possible  explanation for introducing the supplementary submission rule into the  arbitral process was to conform with litigation practice in the U.S.  since UDRP complaints perform a dual function in both stating a claim  and moving for relief; so that while additional submissions are  generally discouraged an argument can be made for them on the ground  that UDRP complaints are essentially motions for summary judgment.
In  any event, the  temptation for last words is often irresistible but in  this forum the general rule is that parties are expected to get their  contentions and proofs right in their initial submissions. Rule 7  properly used allows parties to sum up their adversaries' deficiencies;  used improperly additional submissions contribute nothing new to the  argument and have led to puzzling awards. This explains the tension in  Rule 7 and the split that occasionally rises to the surface.
One of the veteran panelists for both WIPO and the Forum has long questioned Rule 7. In YETI Coolers, LLC v. Ryley Lyon / Ditec Solutions LLC,  FA160500 1675141 (Forum July 11, 2016) (<yetihandles.com>) he  explains that whether to request additional submissions under Rule 12 or  accept Rule 7 submissions is left to the discretion of the Panel.  Paying the Rule 7 fee does not guarantee that panelists will (or should)  accept additional submissions. In Yeti Coolers, “Complainant’s  Additional Submission did not address any new legal principles or facts  that could not have been anticipated in the Complaint [and for this  reason the] Panel disregards the Complainant’s Additional Submission.”
The  key to preparing a UDRP complaint is “anticipating” respondents’  counter-narrative and defenses, which can understandably be challenging  when doppelgangers may present themselves with having completely  different associations than the mark as conveyed to consumers. In Yeti Coolers the parties were engaged in a genuine dispute over a nominative fair use defense.
Panels should only invoke Rule 12 requests for clarification, Wild PCS, Inc. and Tom Yang v. Perfect Privacy, LLC / Choi Lam, D2016-0017 (WIPO February 17, 2016) (<wildpcs.com>), not to assist a party, VideoLink, Inc. v. Xantech Corporation.  FA1503001608735 (Forum May 12, 2015) (“At the request of the Panel  pursuant to Rule 12, Complainant provided an Additional Submission  contending that the UDRP analysis should occur not when Respondent  originally registered the domain name but when Respondent renewed the  domain name in June 2010.”)
VideoLink excepted (renewal  of registration is not grounds for forfeiture under the UDRP), WIPO  panelists generally favor the more cautious approach to additional  submissions (requested or unsolicited). The view expressed in Yeti Coolers has a long history. A veteran panelist speaking at the end of UDRP’s first full year stated in Viacom International Inc. and MTV Networks Europe v. Rattan Singh Mahon, D2000-1440 (WIPO December 22, 2000) that
it  would, and should, be in exceptional cases only that supplementary  submissions are requested by a Panel. If requesting supplementary  submissions were to become unexceptional, the dispute resolution  procedure under the Uniform Policy and Rules would most likely become  significantly more resource-consuming to all the actors (i.e. the  parties, the dispute resolution service provider, and the Administrative  Panel) than is currently the case, as the unfolding scenario in this  case demonstrates. Such an outcome seems contrary to the clear intention  of ICANN in adopting the Uniform Policy and the Uniform Rules in their  present form.
Where the Panel in Viacom International found Complainant’s request to supplement its complaint “exceptional”  and accepted (specifically requested by the parties, not unsolicited),  the Panel in Yeti Coolers used the principle to reject Complainant's submission.
Forum  panelists generally accept Rule 7 submissions without question even if  they don't materially advance a party's position. They are certainly  considered where facts emerge in the response (history of use for  example) that complainants could not possibly have known about and have  to address cold.
The Panel in Data RX Management, Inc. v. Network Services / MindViews Limited Liability Company,  FA1608001687126 (Forum September 16, 2016) (<datarx.com>)  accepted the additional submission without question even though it  clearly advanced no "new legal principles or facts"; rather, it found  the domain name “so generic that it is conceivable that the Respondent  fell upon the disputed domain name without knowledge of the common law  rights of the Complainant.”
Data RX is interesting as an  illustration of Complainant's “anticipation” failure; it “submitted no  evidence ... that adequately [addresses] any of [its] claims.   Therefore, there is no evidence that Respondent registered the domain  with knowledge of Complainant 13 years ago or that it intended to  exploit the purported value of Complainant’s mark. Where complainants  have failed to support their case with sufficient evidence, panels have  found for respondents.”
Failing to support one's case applies  equally to respondents failing to present sufficient evidence of rights  or legitimate interests or rebut bad faith.  Well-known trademarks  composed of common words, for example, may appear vulnerable (and could  be under the right narrative and proof) but nevertheless protected  against opportunistic appropriation. It is not sufficient to argue that  the dominant element in a domain name is a common word where the second  level domain suggests a relationship with the trademark owner.
In Enterprise Holdings, Inc. v. David Morris,  FA1607001685615 (Forum September 8, 2016)  (<enterpriservrental.com>) Respondent argued that "the only thing  the Complainant has in common with the domain name <enterpriservrental.com> is the word 'enterprise.'” In its additional submission Complainant  pointed out that Respondent was using the wrong test. The domain name is  confusingly similar because it suggests a relationship between  Respondent (in the vehicle rental business) and mark owner (in the car  rental business).
Complainant's principal argument in Enterprise Holdings was embedded in its complaint, namely that “Respondent’s resolving  website displays a ‘Brandon RV Rental’ header” so “why [did] Respondent  register[ ] the disputed domain if Respondent is known as and operates  as Brandon RV Rental [?]” Respondent’s counter-narrative that it “has a  legitimate interest in changing its name eventually to erase local  geographic biases against the word ‘Brandon’ in its name” may in fact be  true but that's not the "legitimate interest" a respondent has to  prove.
While complainants cannot monopolize common words they can  prevent others from capitalizing on the goodwill  complainants have  established in their marks where the manifest purpose is attracting  traffic to respondents' own websites for commercial gain as described in  paragraph 4(b)(iv) of the Policy.
The Panel in Innovative Marketing and Distribution, Inc d/b/a Engel Coolers v. Michael Harrington,  FA1606001678152 (Forum July 5, 2016) also accepted Complainant's  additional submission without questioning whether it added new facts.  Respondent was a contract distributor of Complainant's product: "For its  part, Respondent argues that Complainant`s statement about the  revocation proves that at least until April 4, 2016 Respondent`s  registration and use of the disputed domain name was not in bad faith."  This puts the dispute outside of the jurisdiction of the Policy, and the  Panel properly dismissed the complaint as not arbitral under the UDRP.
Two  kinds of disputes arise with distribution agreements, namely they  either provide for a divorce contingency and specifically address the  issue of domain names; or they fail to specify post termination rights  to domain names lawfully registered to perform services under the  agreement. Apparently, the distribution agreement in Innovative Marketing was unclear about the “effects of Complainant’s revocation.” Unless  prenuptial agreements are clearly written they raise questions of fact.
The contrast between panelists assessing complaints filed with WIPO and the Forum is illustrated in ROAR, LLC v. Jonathan Shalit, ROAR Global Limited,  D2016-1574 (WIPO October 4, 2016)  (<roarglobal.com>). In this  case, the Panel found the request not exceptional and rejected the  additional submission:
Complainant had multiple  opportunities to file evidence to support its allegations, having filed  two amended versions of the Complaint (i.e., three versions in total).  As the Complainant chose not to do so despite several opportunities, the  Panel has decided not to exercise the Panel’s power to request further  evidence from the Complainant.
And concluded that
It  is the Complainant’s responsibility to present a complete case to the  Panel, and it made the decision to rely on bare allegations with no  evidentiary backing.
Roar, LLC incidentally was represented by experienced counsel; a good, although negative example, of not getting it right.
Mr. Levine is the author of a treatise on trademarks, domain names, and cybersquatting, Domain  Name Arbitration, A Practical Guide to Asserting and Defending Claims  of Cybersquatting under the Uniform Domain Name Dispute Resolution  Policy. (Legal Corner Press, 2015). Learn more about the book at Legal Corner Press. Available from Amazon and Barnes & Noble.  Ongoing Supplement and Update here.   Supplement and Update through August 2016 will be available in e-book  format on October 1, 2016; the print format will be published on October  15, 2016. The Supplement and Update will also be available in pdf  format from the publisher’s website. See forthcoming announcement.