Oh, Deadlock, so going to argue that it wasn't alternate universe Harry, just original Harry (and entire Voyager/crew) being duplicated by the rift, then one set of dupes becoming slightly less alive.

So they all got Lieutenant Rikered, both being the original, just one didn't lose his mind imagining Talking to Troi for years... well, maybe Harry does have a thing for Troi too, dunno.