I've seen only clips this year so I can't comment much about his current state, besides from what I've read. However, I don't know if he's that far from a chance with McDavid, even if there's things to work on. I mean, people are suggesting e.g. Caggiula there, and IMO Jesse's offensive potential is better already now. Last year Jesse and McDavid had four games together, and those went really well. Actually McDavid had eight or nine games without scoring a goal before that, but had a hat trick in the first one they played together. This season they were put together during two preseason games and in the first of them Jesse was selected the best player of the game and scored good points, so I don't think it was that bad.
Otherwise I'm not saying when I think he should be brought back, just wanted to state my opinion that a player doesn't always have to be ready in all aspects, if he's clearly better than other options in some important areas. Whatever makes the team succeed, especially in the short run, but without forgetting the longer one either.