Board Thread:Theories and Speculation/@comment-30168130-20161223235115/@comment-734582-20161229093438

Lorenzo.r.1st wrote: but do remember those were jutsu, so chakra is gonna be existent in them anyways It doesn't explain why Edo Tensei can generate infinite chakra. it doesn't explain how, after both being thoroughly exhausted of chakra, DMS Kakashi could whip out a bunch of high-powered techniques.

If we go by the whole "souls can generate chakra on their own" thing, then it does make sense. After all, how can Hagoromo call back souls from the afterlife (Who according to you have no chakra) and use them for a massive summoning, if the chakra comes from hagoromo (who had almost no chakra left?)..

The Biju don't have actual flesh and cells, they're entirely chakra.