Kozlov is an absolute beast. I remember seeing him just annihilate the jobbers that were put up against him on Smackdown, and just having my jaw drop. The guy has all he needs wrestling wise to be a champion, but what is holding him back in my opinion is his trouble on the mic. And in my opinion, this my friends, is why he's playing a role of "enforcer" for William Regal. It's a role Vlad can fit well, but as long he is there, he's not going to get noticed much and like some posters above have said, will not have any momentum on his side.
This is when you start to think though, what now is either one of Ezekiel or Vladimir getting out of this stable? Nothing, other than getting to assault Regal's opponents on command. That's why I've got a feeling a Ruthless Roundtable breakup may be upon us. You wouldn't need to have either 'Zeke or Vlad speak much, as even the two men turning around and just laying it on William would do it for me.
So overall, I already respect the guy (Kozlov), but I think it's gonna take some work on the mic to get others to do the same.