Board Thread:Theories and Speculation/@comment-26479810-20191214162345/@comment-32685487-20191220172708

He is walking around inside the dimensions, he wouldn't get exhausted from walking around leisurely where he can easily sit and take a break, so it is def the dimension hopping that exhusted Sasuke. Also having Hashirama's healing ability is great, but don't forget that the only reason Obito is alive after the Gedo and the TB's were completely removed from him is because Naruto was able to temporarily stabilize his life force thanks to Hagoromo's Yang Seal. Obito was still dying and the Hashirama healing ability still requires enough chakra to be able to heal which seems to not have been enough to deal with his eyes because they kept on bleeding.