Quote Originally Posted by Rikudo
Maybe since Kyuubi is pure evil chakra that anyone who tries to wield its power will cause some sort of injury to the user.
If that was the case then why would Akatsuki collect Bijuus?

It'd mean that it was 1-time control which would be no control at all really...

Apart from that up to now Kyubii has been downgraded by Kishi showing even Sasuke suppressing its chakra with ease. (encounter inside Naruto)

Not to mention it was when Sasuke was still cursed seal n4p Oro boi.

IMO - There was no need for Madara to use EMS in situations we were shown and that's the only reason we haven't seen it yet.

It will be shown on a special occassion, a battle ending with Madara's death would be my bet (or at least a major ass sweet battle).