Tonga can't play all game, that will get him hurt quickly. The coaches and CougarBoard are preaching that depth is getting better there.
DT's are Tonga, Fauatea, Tuioti-Mariner, El-Bakri, Tuiloma, and Chambers(although he is listed at defensive line, I think he may be OL now... other CBer's can correct me on that one.