from reports it sounds like he is struggling some with his fitness and size. This is part of the reason I have wondered why they don't move him to OG? That and the fact we are like 3 or 4 deep at NT. Can he play DE as I agree that is where we could have depth issues.
For my money, I think Takitaki has the size to play DL, but not sure as a true freshman. He was a bulldozer in hs. I wonder if Cook or Hinds might eventually play DE...they have the body for it if they wanted to add weight. Most seem convinced Hinds will play the hybrid lb/DE like Kafusi.