I don't think he was every ready in '23. Specifically against Purdue he was calling some plays but wasn't doing it quickly enough. At one point you can see Day lose it and say something like "give me the fucking sheet, I'll do it."
Maybe he's ready now, but the answer isn't hoping he is. If you don't want Kelly back, you have to go out and get someone else. I don't want to jettison him into the sun yet because I'm not sure how much anyone can do with your top 2 OL out and your QB playing poorly. To use the WRs you still need a QB who could put together a drive and whether he was slightly concussed or just bad, Howard got worse and worse as the game went on.