he'll probably have sacrafices for Manda to please him

and yeah he can just resign the contract, theres something about him though - its been hinted that he wasnt actually human or something


as for Kabuto yes he did have the chakra to summon Manda, and the other 2 snakes, then he fought Tsunade and Shizune and took a rasengen in the stomach... if that isnt proof that hes stronger then Kakashi then what is