You've described five minutes of a 45 minute show. The other 40 minutes were pure filler. Also, I ask you this: What does Henry being back bring to the table? It seems to me his entire purpose was to reinforce Barry's doubt about attempting to regain his power's (which I'd argue is a conflict that was filler). The Jay Garrick thing was a throwaway line that could've been delivered at any time. As to Wally and Jesse, we do not know what has happened to them yet. Zoom taking over Central City is really the only component of this episode that moves things forward (as I'd argue Barry being "trapped in the speed force" is just a way to prolong this unnecessary, filler-esque arc). As tonight's episode showed, Zoom taking over Central City can happen in about 5 minutes of screen time. It didn't take a full episode of angsty Barry to establish that.