Board Thread:Naruto Discussions/@comment-26273905-20150403160041/@comment-3279282-20150405230304

Logical conclusion my ass. The fact that you need the beasts for the Coffin Seal is in no way proof that you need them for the Sage Mode as well. They're two different things, one is a mode, the other one is a transformation. One makes you more SO6P like, the other one makes you the TT's jinchuriki. You can lose your mind because of the Coffin Seal, but not because of the Sage Mode thing. One is a Senjutsu, the other one is a Kekkei Genkai.

They're all but the same.