A misunderstanding with Susanoo
To get Susanoo you dont have to get both powers Amaterasu and Tsukuyomi, this is what people think.. no no.
What you need is to unlock your 2 OWN specific powers in MS, each in one eye, and when you unlocked them you get the Susanoo. Its ridiculous that some people in NB still dont know this... but by the fact Kishi has given us this is really obvious how you get a susanoo. And if what I said now isnt true, then this wouldnt imply Madara.
Now I dont wanna bring up facts and proof, its time consuming and it should really be obvious by now.
Madara: He got his two tricks unlocked
Sasuke: Amaterasu and blaze release
Itachi: Amaterasu and Tsukuyomi
Obito doesnt have the susanoo because he hasnt his other original eye, so therefore he couldnt get it when he implanted another uchiha eye in his left side.