Board Thread:Naruto Discussions/@comment-26993711-20160707202551/@comment-9782468-20160708040520

@Actionmanrandell, Obito doesn't phase through barriers, he teleports completely into the Kamui dimension then comes out on the other side.

Also, if he was phasing through Susanoo he couldn't absorb anything into Kamui's dimension since he can't use both powers at once. I'm not sure what would happen if he tried to touch Susanoo to absorb it anyways, it might just harm him on contact.