Thanks for the quick response, Chris.
Unless I've recently returned from the Twilight Zone-- anything's possible-- I *know* that I have removed two copies of such messages post merge. (Unless the two copies I deleted were Unmerged Match or Rejected Match comments-- are they treated differently?)
In any case, I think what you're reading here is that the merge request comments *should* be on both profiles. As we've been seeing elsewhere, it's not just profile managers involved with merges, and I think it's important that readers of any to-be merged profiles should see these. Yes, it means we have to delete two comments post merge; so what? ;-)
And IF you really really really only want one copy to appear on a profile, I concur with Peter K that it should be on the higher-numbered profile. BUT I think it should be on both.