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 anyone 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 exception is Kaguya who 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 received from Hagoromo, Sasuke cannot use Senjutsu so he couldn't activate it. May be it has connection to tailed beasts also.