Durant left because he grew tired of watching Westbrook play hero ball and chuck up bricks while making stupid mistakes down the stretch of important games. Durant packed up and went to play for a less selfish team. So, in a way you could say that Westbrook did indeed ask for this role. Other than that, I'm not sure what (if any) point you were trying to make with that comment.
Well of course he didn't ask Durant to leave, Durant wanted to leave because it has to suck playing on a team with someone like Westbrick.