Board Thread:Theories and Speculation/@comment-32617252-20171101024222/@comment-734582-20171112193249

Lorenzo.r.2nd wrote: but for suigetsu to get stronger than his usual self, he could need a much bigger, outside source of water. For Sage Mode to work, you need an external source of NE. For Jinchuriki, you need an external source of power from a Biju.

Suigetsu's technique allows him to alter his body to become stronger.