Short answer: Yes.
I just don't think getting Griffin (or Favors in that proposed trade) is too likely. Ibaka is a possibility but you get what you pay for.
Shorter answer: No.
Can you imagine him trying to defend Draymond Green or Kevin Love???
I can.
He's listed at 210 or less, so he'll need to add some muscle.
But consider these assets:
1) Great footwork, great laterals. Has good flexible hip joints.
2) Excellent defensive awareness and anticipation. Rapid closeouts, and can use his length - very promising as a weak-side shot-blocker. Quick shoulders, gets his arms up.
3) Gets both blocks and steals. Good hands, good feet.
4) 6'8" and mixes it up for boards. Defensive rebounding was, I think, the big defensive issue for Boston last year - if he can rebound like a swing rather than a small forward, it'll help him get minutes early on.