I really enjoy the mental exercise that comes from being a "yes, and..."-style DM. In this case, I mean, I never would have thought of Ghorrak as a Cavalier at all, but now I can imagine that he comes from a mounted orc tribe (kinda like Rohirrim). Except perhaps they rode something more fanciful than horses. Drakes? Extra-tough lions? I dunno. At any rate, he would have been captured by Thayans as a youth and trained to be a body guard for Red Wizards. None of which ever broke his spirit.
I don't imagine him as good (alignment-wise) in any way, really, but he's admirable.