Originally Posted by
DB_Hunter
Don't buy that. If Tobi acknowledged his own body aka Madara being in Kabuto's control then letting Kabuto live is allowing his balls to rest in Kabuto's palm. By letting Kabuto live he is handicapping himself by allowing an Edo Tensei user to be able to control his body. He would know that the minute he turns his back on Kabuto he could pull out his body and wreak havoc; any deal done between them like the one they have would be meaningless.
That would be a reason over and above anything else to kill Kabuto/attempt to kill him asap, but he hasn't done it. Instead we see Tobi rushing to activate his mega jutsu, which would mean anything that he is doing now is about pursuing his real objective rather than trying to unify with his dead body.