Board Thread:Versus Debates/@comment-30168027-20161030085406/@comment-734582-20161212090831

Lorenzo VonMT wrote: If he did have infinite chakra, then he would have been able to sustain himself, but he didn't thats why he disappeared. He also told kakashi that the power he's giving him is temporary. Obito disappeared because he wanted to. He ended the technique on his own account.

Lorenzo VonMT wrote: Minato, kushina, the sage of the sixpaths all came back in spirit form like obito but they all disappeared because they didn't have infinite chakra. Minato and Kushina were not spirits, they were imprints of chakra that were very much finite.

Finally, Edo Tensei do not have literally infinite chakra, mind you. But they do regenerate fast enough that they do not tire or run out easily.