Yo guys there is one thing that you people are forgetting Obito and Kakashi have the same eyes THAT VERTUALY MEANS THAT THE BOTH HAVE THE SAME SPECS . THE ARE ALL AT THE SAME LEVEL what makes me believe in this is the fact that when Rin died kakashi and obito;s sharingan all activated at the sometime but kakashi blacked out since he wasn't and Uchiha and wasn't accustomed with the sharingan YET !!!!!!!!!! so that means the can do the same virtually the same jutsus. which will only make their battle stronger and better ?
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They don't have the same eyes..
Tobi has the inward M-sharingan sucking things in his eye
Kakashi has the outward M-sharingan aiming at a distance..
like you have Tsukuyomi as the inward MS from itachi and amaterasu as the outward MS
If the stuff that allows tobi to slip through things is a feature of his inward MS i don't know, it might be his variant of susanoo, his 3rd technique.. though for susanoo you would need both sharingan, but considering kakashi and obito awakened their MS at the same time probably for the same cause and that obito received vision from kakashi's eye at the moment the thing happened that caused the MS to awaken it might be that he has it anyway..
Didn't they actually say you need to have awakened MS in both eyes in order to get susanoo.. well he awakened it in both eyes.. it's not like his other eye is destroyed or blind by using izanagi or izanami or whatever.
Susanoo is itachi's ultimate defense, that stuff of obito is his ultimate defense.