One advantage Tua has it that both Hill and Waddle get open quickly. But totally agree with everything you said.Tua, MCD, and this oline, those are the need to prove it areas imo.
Tua if he can read coverages post snap..and if he learns to use his legs better to cut up defenses.
MCD if he can call plays and if he has the game to get players to play angry at times.
Oline to see if coaching and another years experience can at least bring us to respectable.