What rest do you speak of?Warping other people wouldn't work regardless because Obito was fighting Naruto, Sasuke, 4th, 2nd so that would lead him to become vulnerable if he tried to warp someone. Answer the rest of what I posted? *patiently waits on a cliff*
He has the TBB, avoiding damage should be no problem.
Ironically you also said vulnerable when he could regenerate pretty much anything off, and has the TBB to defend him.