Board Thread:Theories and Speculation/@comment-27821284-20160218112823/@comment-3965545-20160222170430

You see that's not how it works.. chakra gifts alone are temporary no exceptions. Danzo needed the Hashi face(flesh and the chakra it generates) to have hashi chakra AND wood release permanently(almost lol) Madara needed to implant the flesh/cells into his chest wound in order to get Hashi chakra and Rinnegan(he did not get wood release as you need the Hashi face for that except in a zetsu's case, or yamato's case) Sasuke's heart was repaired with Hashi cells. If somebody simply gives you chakra, it will expire eventually because you have no source to regenerate that chakra because it isn't YOURS. That's why Kakashi could never keep the DMS after Obito left.