They cannot get of a block even against smaller offensive lines. They overrun the play constantly, they don't plug gaps and seem surprised everytime the opponent pulls. I don't think Tuiaki has ever heard of a stunt either. Awful technique all around. Plain and simple, he is not a good football coach and has no eye for the detail required to be on a D1 staff.
My best guess is Kwhitt only had him on his staff to help recruit. That seems to be his strong suit.