Ok, so we all know that when the Sage of Six Paths defeated the 10 Tails, he separated his power into the tailed beasts. Before he left them his exact words were "You will always be together, even if you are separated, and one day, you will all become one." What were they when they were together at first? the ten tails. The 4 Tails also believes that Naruto is the one the sage was talking about, which could be referring to Naruto as the one where they all join. That would give them reason to join inside Naruto. Each beast gave Naruto a certain amount of power, which is yet to be determined. I think that this will allow him to muster it together and achieve ten tails form, or at least a form of it similar to a tailed beast cloak or maybe 4 tails.
The quote is from 572 page 9 couldn't figure out how to embed it.
The quote is from 572 page 9 couldn't figure out how to embed it.