Board Thread:Theories and Speculation/@comment-24824859-20150704165201/@comment-5407586-20150705172600

Minato stated that TSB are particular in that they can't be activated or deactivated, unlike pretty much any other jutsu. The only known example in which an user consciously created a TSB was when Kaguya created that massive one in her own dimension. In other cases, they just appeared and disappeared along with particular chakra modes (Ten-Tails' Jinchūriki, Six Paths Sage Mode, Tenseigan Chakra Mode); the only exceptions to this are Hagoromo, Hamura and Obito (the first two had TSBs without being TTJ or having any Mode active, the latter used Black Zetsu's mass along with a portion of Madara's Six Paths Sage powers to create a single TSB). The main problem is that Madara and Naruto never created new ones to substitute those they lost (Obito isn't in the list since he had all the TSBs until he lost the tailed beasts to the Alliance in the tug-of-war). Even more than a decade later, Naruto's 6PSM had zero TSBs, meaning that he lost all TSBs against Madara, Kaguya and Sasuke.