Board Thread:Theories and Speculation/@comment-31852758-20170427195951/@comment-31793602-20170427225933

If I remember correctly, Hagoromo said he'd free the Tailed Beast but still leave some chakra from all of them inside Naruto so they can communicate with each other or meet through him. So if we stick to that logic, I guess it makes sense that Naruto can still use some of their power and that some might have reunited with their host or found new ones.