Board Thread:Naruto Discussions/@comment-26508646-20150704031517/@comment-6769189-20150711195019

Naruto broke the seal. There may not even be a seal anymore and Kurama voluntarily rides in Naruto, further evidenced by Hagoromo saying they all helped of their own free wills. But even if it is sealed, the 1 and 8 Tails chakra was a limited amount, just like Kushina and Minatos chakra it won't last forever.

Hagoromo said that the Tailed Beasts chakra was inside of him, not that it was constantly flowing into him. Either way, that was before he used all of his chakra reserves fighting Sasuke.

The 10 tails is the Gedo Statue+the 9 Tailed Beasts. Obito and Madara had all of the Tailed Beasts inside of them because the 10 Tails can't exist and be at full power without the 9 Tailed Beasts inside of the Mazo because the 9 Tailed Beasts are the 10 Tails chakra. So yes Obito and Madara were the Jinchuriki of all the Tailed Beasts.

They could have used the powers of the beasts but they chose not to. Naruto only used their powers on 3 separate occasions, so that point is kind of moot.