yes he possibly can, edo tensei control is much like how nagato controls his paths by transmitting chakra to the puppets or in this case edo tenseis
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(kabuto absorbed orochimaru's senjutsu chakra from anko's curse seal)
naruto shook off nagato's control because of the overwhelming power of kyuubi's chakra
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thats why hashirama was able to shake it off because his chakra is way more powerful than orochimaru
KCM has been shown to be on the similar level of power as hashirama's chakra
just by being near to KCM chakra, trees start growing out of mokuton constructs just like hashirama does
it has also been shown that using powerful chakra you can break out of restraining jutsus, barriers etc
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to completely escape out of edo tensei however you must know the seals but that isnt an issue as being a hokage he would have access to all the scrolls (containing information about jutsus like edo tensei etc) that other ninjas cant
why he didnt do it at the uchiha hideout?, because he would have to use BM kishi might not have wanted to reveal his BM at that time