can it be assumed?
Itachi can use Tsukiyomi and Amaterasu. Mastery of Tsukiyomi (genjutsu) and he wields a Genjutsu sword that seals someone away in a eternal genjutsu.
Sasuke uses Blaze Release and Amaterasu. Mastery of Amaterasu and he wields an Amaterasu sword/arrow.
so now let use look what obitos susanoo would look like. One Kamui absorbs close distance, the other large distance.
I believe maybe the susanoo that is resulted from this has something to do with space time techniques. maybe obito can teleport himself together with his susanoo and make it intangible. maybe it has a space time sword that is able to absorb anything it pierces or touches in the other dimension. or it can create space time barriers like minato and use large scale kamui. i think it is something like this.