Board Thread:Theories and Speculation/@comment-1872728-20181213131712

Alright so here's the thing, the form that Obito and Madara took on after becoming Ten-Tails' jinchuriki is called "Sage Transformation" because they transformed into the sage, and the sage being Hagoromo.

But here's the weird part, just because Hagoromo was the Ten-Tails' jinchuriki, if a person also becomes the Ten-Tails' jinchuriki, it doesn't transform you into Hagoromo, because if that's the case then Naruto would transform into Kushina or Mito or something.

So what would make more sense, is that the "Sage Transformation" is just Tailed Beast Transformation, because they're actually turning into Kaguya, and since Kaguya IS Ten-Tails, it is therefore a Tailed Beast Transformation. The tree form and the monster form are all Tailed Beast Transformation, they're just different forms of the same Tailed Beast. 