Look at KDB's last two games, he didn't even try. If that's not saying let me go, I don't know what is. About what further happens behind the screens, nobody knows. Remember when this saga started and he said I'm not allowed to comment? Maybe Allofs had told him "You want your transfer, fine. But you keep calm about it". As far as I understand, a transfer request doesn't give any legal adavantages. You're just letting it publicly be known that you want to leave. So what's stopping Allofs from pulling the plug on this deal if he does. He seems spiteful enough. Obviously I'm just guessing here, but it is worth to keep in mind that there may be a lot of things going on that we don't know about. So those that seem to condemn KDB for not trying, please.
Also, slightly off topic, a somwhat interesting article about transfer requests.
http://www.fourfourtwo.com/features/whats-point-handing-transfer-request
Maybe he was having a bad game?
Or maybe he did this because he wants to move to bayern?