From their first encounter? Grimmjow seems like the type who'd be fun to needle from afar. The Doctor's very good at that. Just ask [insert enemy of the week's name here].

But once he learns about the stuff going on at the clinic? Yeah, he won't be happy. At all. Grimmjow had better be ready to be on the receiving end of one of his "one chance/warning" speeches. (And by the way, Grimmjow does have him pegged right; he is a possible threat.)