I'd be willing to make some friendly wagers he won't win, so anyone who thinks otherwise, send your propositions my way.
Now, whether he should win or not, it's not as clear. He's easily the best defender in the league, by position. However, defensive bigs, or wings, are generally incrementally more valuable, as they have a greater overall effect on the game. Also, the fact Bradley has only played 2/3 of the season has to count against him. Basically, I just don't see his overall contribution being enough, but, he does deserve to be in the conversation.
He absolutely deserves to be All-defense 1st team, though.