Sasuke's idea was good. About Tobi, I don't know if he still alive. and for Deidara he is dead. He said that death will transform him into work of art. means suicide bomb. For Tobi, Deidara said sorry to him but I don't think he is dead. He's good in escaping and also, he never meet kakashi yet, if tobi really is obito. If he isn't Obito, so Tobi really died.