About shisui's its about the same, he's dead anyways and Itachi did it or just helped him commit suicide its almost the same he's dead anyway.. And Obito dude its 0 precent.. Obito LOST BOTH OF HIS EYES, HALF OF HIS BODY, HE WAS SUCH A LOOSER HE CANT EVEN DO A Fire ball jutsu at his age, HE WAS RECKLESS AND THE ONE WHO SEEM don't like to use his brain, all these facts are opposite Madara's.. He had both eyes, body, he was one of the most talented and strongest ninja in the history, also he was verry smart and all.. And Izuna, it might be him, we dont have clearly alot of facts, yes we saw his body, but it doesn't prove anything.. However lets take all thread together all theories and facts and there's the most posible that .
Madara splited him self into his self weakend version and he knew that the clone will revive him, bicouse he gave Nagato the rinnengan... Or just, he told clone to end a job and when done revive me with nagatos power of rinnegang, since clone failed, bicouse nagato bettrayed him, he was about to take a place of Real Madaras, till the last coffin cracked..