Well, I'll have to come back to this idea. I ended up bear tanking (bleh, not for me) to 60 then made a DK to tank and it's been a pretty fun team, although I miss all my spell interrupts (I think I can do this on the fel hunters when I eventually key-step pet abilities.)

I screwed up a lot of Cata mechanics and surprisingly, the team still survived. Haven't tried Oz yet, as a tank I haven't a clue what dps/heals do during that fight, so I'll have to google. Pretty impressive given it's stock ISBoxer, minus VideoFx healing and one stepped aoe key-bind. Once macro'd, pro-config'd and geared it must be pretty amazing. Albeit, did a lot of conservative pulls around corners and then the Locks and minions jumped them

It's pretty funny to watch the 'green-suck-life' lock spell drain a mob before they even get to the tank.