In the last episode we could see the black spheres from Madara being sent to the other dimension by kakashi. I was thinking, since we don't know too much about those spheres that I'm gonna add a theory I've got. Basically the 10 tails jinchuuriki automatically gets them as he becomes one, as both obito and madara has had them.
I noticed that there are 9 spheres, so my idea is that there is one sphere for each Bijuu. So each sphere contain mixed chakra from each bijuu that the jinchuuriki can use for offense or defense. It was also said in the last chapter that madara "wasn't able to control them". Just like Obito wasn't able to control the bijuus earlier before he became their jinchuuriki.
Now if the spheres contain chakra, maybe naruto will be able to absorb them now that he already has chakra from each 9 Bijuu, for his next powerup towards sage. What do you guys think? Kishi hasn't revealed really so far what those spheres really are, like the jinchuuriki's staff. So I think its mixed chakra from each jinchuuriki, nothing less then that. If that's true, there shouldn't be any reason for Naruto not to absorb them.
You must be registered for see images
And
You must be registered for see images