If Green is clearly the best player available at #3, I'd have no problems with the Bills trading down. Even if Green turns out to be a 10 year Pro Bowler, at some point the Bills have to address the putrid Front 7. Draft looks pretty heavy on defensive linemen. 2 front 7 guys, an OT, and a QB of the future with #17, #28, #33, and #34 sounds good to me.