I haven't watched the recording of the Vandy game yet, but from the stands it looked like Joe definitely had a couple over throws, but altogether not that bad. The one to Hyatt down the visitor sideline (I believe it was right after they fumbled the fake punt, and the play just before Hyatt drew the DPI for getting tacked running a deep route), it looked to me and the folks around me like Hyatt slowed down a little while the ball was in the air, which caused it to be "over thrown".
I wouldn't be surprised if there are other dynamics for the receivers when catching throws from different QBs, such as trajectory of the ball, etc. Maybe Hyatt slowed down because he would have needed to on a similar throw from Hooker. If so, that gives me some extra hope for next year. If not, I don't think his over throwing issues can be fixed if they haven't been able to by now.
I thought the worst one was where Milton missed Fant wide open on the seam route. Again, I haven't seen the replay but that one left us speechless. Did he really miss that throw as bad as it seemed?