Board Thread:Theories and Speculation/@comment-28464629-20160515105435/@comment-5936871-20160515183746

When Hagoromo became the Jinchuriki of the Ten-Tails' then yeah he was definitely the absolute strongest. Considering the Ten-Tails is Kaguya and the God Tree merged into one so that means that Hagoromo would've had his own and his mother's power in one. When he was talking about his mother being more powerful than himself he must've been referring to her being stronger than him individually.