Board Thread:Theories and Speculation/@comment-25139119-20150807165411/@comment-6769189-20150809215539

Narutos understanding of all things couldn't help completely fix Guy. Where did he ever summon the beasts? He can speak with them but never was it said or shown that he can summon them.

Minato used a very specific process for splitting Kurama. Whether or not the tailed beasts can consciously do this is unclear. Considering none of them ever did, I doubt they can, or else the fight against Obito/Madara would have been significantly easier.

Kurama had to nap to regenerate his chakra, buuuut you kinda need Kurama there to regenerate the chakra. If he was separate form Naruto then whatever chakra he used would have been gone.