Tszyu's timing would be more than enough to beat shane. Tszyu wouldn't need to outbox him he can just wait for him to start throwing his 500 tickling little jabs and wing his right and it's Mosley-Forrest 1 all over again. I imagine if he did come back he would be gunning for Floyd right away though, for Kostya it would be an easier fight than some of the smaller fights at 147