Re: Obito's Susano'o
1 not every uchiha that awakens the MS awakens Susano, it's not something that is automaticaly there, and not every MS owner has the same tech, they are not linked, madara also never displayd tsukiomy or amaterasu, for now he only showed susano.
2 as it is stated above, you require 2 MS eye's (probably of the same original person) to awaken susano, as it seems to be something personal, they all look different.
for now 5 MS tech are known, tsukiomy, amaterasu, kamui, koto amatsukami and susano, no person has been known to have them all, so it's safe to say that not all MS awaken the same lineup of tech. and who sais that these 5 are all there are? it was reveald that the uchiha did experiment with MS a lot, so there are possibly tech we don't know of, and one will be more common then the other. tobi stated that awakening susano was rare