Board Thread:Naruto Discussions/@comment-24531362-20140831150337/@comment-1512913-20140903221441

Seriously, the workings of brain tissue of some individuals is quite mysterious to me. When Naruto was losing control, he turned into Kurama. When Fukai lost control, he turned into Gyuki etc.

So logically a TT jinchuuriki, if control were lost, would turn into TT. And TT is Kaguya as you may know. She was shown transforming at will in case you didn't notice.