He may well still be "not fully right" but his play can't be explained simply by saying "he's hurt."
Some of it has nothing to do with a throwing elbow, like reading defenses pre-snap, good decision making, and focusing on proper footwork and throwing dynamics. I just think he has regressed into a slump that has lasted a while now. The elbow injury surely didn't help, but I don't think that's the full story.
The trick is for him to figure it out and come out of it in time for the playoffs.
If he plays like this in the playoffs, we won't go very far.