Board Thread:Naruto Discussions/@comment-36221354-20180717114536/@comment-6769189-20180719034634

The Otsutsuki(Momo, Kin, Ura) never ate fruit directly from the tree unless the anime changed that. They would "inherit" the powers by consuming others.

As for Madara saying Kabuto was wrong. He didnt. He told him not to think he created Madara's power. Madara's strength and abilities were something he once had and were latent within him.