Board Thread:Theories and Speculation/@comment-4688597-20150529040116/@comment-25549954-20150529055037

I think TSB comes with Natural energy, think of it like this- Madara got TSB because Ten-Tails was largely made of Natural energy, so someone who can harness natural energy i.e. Senjutsu and combine all elements can get TSB, TSB can't be created and it automatically comes with the mode, only Kaguya was able to create it and her TSB was not on stand-by like the others. I think the trigger is Six Paths Sage chakra which Naruto recieved from Hagoromo, Sasuke cannot use Senjutsu so he didn't get it.