He felt he wasn't valued anymore. He played with the OKC but was not used. Things really changed after the injury for him; it was huge and affected his role. I see him in a similar situation with Deron Williams, who was also one of the best players for the Jazz before he got injured and traded, and after that, his career started to decline. So those players who have the skills have to be careful, as injury is a hard battle to win. Only a few win against it; to name one, it's PG, who recently secured a huge contract with the 76ers.