Board Thread:Theories and Speculation/@comment-25139119-20150807165411/@comment-6769189-20150809234343

Obito summoned the beasts because he was in full control of their physical bodies. He had previously captured them and held them in the Mazo. He didn't just go "I see a Tailed Beast. SUMMONING JUTSU" if this were the case the FSWW would have been a back and forth of summoning.

It does matter how Minato split Kurama. He took Kurama and made him into 2 physical beings. None of the other beasts did that. They lent Naruto chakra, their energies, but didn't offer up their bodies. It has been stated many times that he has their chakras, not bits of their entire being, something that is made clear when referring to the 2 Kuramas,

@Kuroi: I think you misunderstood what I wrote. Yes, he saved Guy, but he could not fully fix him, he was still crippled. Same with Obito, he could not stop him from disintegrating. Just because Naruto understands all things doesn't mean he can do everything.

Notice how he does not use Wood, Ice, Dust, Explosion, Scorch, or Storm Release. He has at least 2 of these. Just because he understand how these things work doesn't he can just do whatever he wants. That or he needs to practice.