Board Thread:Theories and Speculation/@comment-5413572-20150114180437/@comment-5413572-20150115170113

Elveonora wrote: Madara didn't contribute anything to the Kaguya make-up, he was simply taken over from loosing control as a jinchuuriki.

Except he didn't just lose control. When Fukai lost control of Gyuki, it was because his seal had been broken; and when Naruto lost control of Kurama, his seal was also eroding, hence the need for Minato to rebuild it. Madara was in full control of the Ten Tails when Black Zetsu pierced him, so unless the latter broke his Coffin Seal (indicating prowess with fuinjutsu that he'd never demonstrated prior, at least to my knowledge), this doesn't wash. Then, too, if it had just been a case of him losing control, he would've logically turned into the Ten Tails, not Kaguya (same basic being, I know, but different forms). The fact that he went more or less directly from his normal form to Kaguya, without apparent recourse to breaking the seal, suggests that a different technique was in play. And the wiki itself only says that will materialization was involved.