Board Thread:Theories and Speculation/@comment-31611719-20170514123545/@comment-30426414-20170515172947

Madara's TSB's and natural resillience are far superior to a mere Susanoo. Sasuke also used his Susanoo as a vessel for a pseudo-TenTails, whereas Madara possessed this power for himself. So no, Madara doesn't gain anything from focusing his power in Susanoo in order to make it stronger.

Yes he does, the susanoo we've seen Madara with was composed of his own chakra. If he used Susanoo while he was a jinchuriki, the susanoo would be composed of the Juubi's unparalleled chakra, along with six paths senjutsu which we know increases the strength of any of the users jutsu. Moreover, susanoo's purpose isn't just for defense, its one of the strongest offensive jutsu's in the series. I fail to see how Madara wouldn't gain anything by using it.