I just remember how unimpressed young Janeway was with Harry in Shattered. She didn't even think of him as an acorn when Chuckles was talking about his contributions to building Astrometrics.
This is why I don't think that B'Elanna's rank is especially "real" ...Why was Harry given command of the bridge and the mission in Futures End, and why did Chakotay have the gall to replace all the Maquis badges with pips in Before and After, and why didn't Tuvok take on a Maquis for a First Officer to symbolically continue displaying unity and why did Barclay still think that Maquis still ran around in there terrorist attire if the Doctor had explained that the crews had genuinely integrated and Starfleet would ratify Janeways invented commissions... That, kind of got away from me.
Lets see... After season 3, why should Kim never be promoted?
He had secret illicit ongoing forbidden sex with an alien he'd been purposely told to keep his pants on around stepping back diplomatic relations with some space gypsies.
He invited a weapon of massdestruction home for tea.
He collaborated with the Hirogen.
He sentimentally annihilated 15 years of future history TWICE where the Federation was basically happy.
He kisses dead people and holographic cows.
He was duped into smuggling weapons which would tip the balance of power in a war the Federation and Janeway had no stake in.
And last but not least...
The Borg Queen thought he was her Boyfriend.