Board Thread:Theories and Speculation/@comment-25093611-20160304230401/@comment-9782468-20160312004423

Releasing the Eight Gates gives you access to more of your own chakra at once. That was explained at the beginning of the series. So he'd have more chakra at his disposal. Like, instead of only using 10-20% at a time, you can use it all.

EDIT: To clarify, it'd make sense if he could shove more chakra out of his feet.