Thane is a goofball. Sorry not sorry.
And I remembered why I thought I could get Wrex: I was thinking (I believe) of Mordin's loyalty mission on Tuchanka. I might also be remembering something from ME3, though. Either way, if Krogan are involved, you know it's going to be a helluva fight. That nasty ol' genophage needs a good reversal.
Take me down from the ridge where the summer ends
And watch the city spread out just like a jet's flame