Just to reiterate what Carrie mentioned, NNS has some really difficult LNAB issues, so they have a process for making merges happen. Sometimes that process is really slow as primary sources are hard to track down to try to call what the LNAB should be. What I usually do if I cannot see clearly how I can help, is to either send a message to the PM to ask for help or look at the changes and see who placed the merge template so I can ask them where things stand on moving it along. Often, it will still be awhile as research doesn't always happen quickly. It definitely is not the responsibility of the person who proposed the merge to do the research, though the definitely can if they wish to help. The profile managers, trusted list members, and the Project members are generally expected to look at the profile and decide if a merge should happen and what changes need made to make that happen.
Best bet, go to the NNS Project Leaders and just ask for help. Carrie and crew a fantastic to work with :-)