we saw naruto reignite obitos life force but the problem is obitio is dying and the reason is his body is to damaged by the rin tensei and the extraction and maybe naruto chakra is causing adverse affects to the hashirama cells like the zetsus so my theory is that sasuke mark allows him to create chakra and objects from nothing so he'll heal/create half of obito body and stop him from dying 1. cause then he wont be the last uchiha 2. to end the cycle of hatred by sparing him 3. cause we need to see what sasuke mark can actually do :yayy: