well the nine tails recognizes the eye of uchiha madara when Sasuke enters Naruto's subconscious, then later when Naruto and his mom are fighting the 9 tails, the 9 tails recognizes the justu she uses at the end. And wasn't said earlier in the manga that Uchiha could control tailed beast with their sharingan. True tobi can't create tailed beasts but the so6p didn't just up and create the 9 beasts it was a last ditch effort to save the world from the 10 tails, but tobi can rejoin the tailed beasts (in theory lol) so doesn't that make him on a close level to the so6p, and who's to say that he isn't using inzanagi to do that. we don't know what's used to store the tailed beasts. If its inzanagi, he's had to use it at least 7 times, which to me shows he would have the ems. and think of this, lets call kakashi a regular sharingan user. He uses his MS for offensive purposes... he doesn't have the defensive eye, he gets drained everytime he uses it. Itachi had both eyes had them activated constantly and died from exhaustion and almost went blind. Tobi has both eyes, and uses them quite frequently...never tiring...that shows me he has the EMS. I just think it offers unlimited sharingan powers.