They actually traded Jeff Green for Perkins and it was a great deal for them even though Perkins was injured. Jeff Green (Scott Brooks' pet player) was the primary hinderance to the development of Harden and Ibaka. After a few games, both those guys went to another level and OKC never looked back. It was an amazing example of addition by subtraction. The bigger problem Presti missed was waiting several years too long to subtract Scott Brooks as head coach.