Those who can't acknowledge their real selves are bound to fail.
How could Kabuto train SM?
Kabuto learned SM thanks to his own or it's only thanks to Orochimaru's chakra?
I read somewhere that he had Oro's chakra to have better snake techniques and ET.
Kabuto learned SM with Oro's chakra or he could do it without it?
Kabuto is mud if he hadn't taken others abilities he wouldn't have been capable of learning sage mode he had excellent chakra control like most medical ninja but thats about it I don't recall anywhere in the manga where it said he had a large amount or a special type of chakra so he's like cell off DBZ overrated because of his stolen abilities.