Really naruto? You're going to pull the whole "this technique has a fatal flaw" routine again? It was bade enough with pain(5 second rule). But now the clone/zombie Midara looks like twice the adversary Tobi is.
Also: Using wormholes and dematerialization in an anime where the main character's attack(and generally most other characters) is just a giant energy punch, is a bit much. The explanation of these techniques is simply "because".
Going on an explanation of why tobi's technique has a flaw would require an explanation of the technique in the first place. (much less kakashi's eye that no longer requires mana).