Dr Lee on the other hand is kind of the franchise's Anti-Rodney. He's amiable, with a kind of well intentioned bumbling incompetence. I forget, were these two ever put together in a scene? If not that's some wasted comic potential right there.
I feel sure that they would have been at some point but probably in an earlier episode when Dr. Lee's idiocy hadn't quite been completely established yet.
I was very disappointed that, when McKay guest starred on SGU, he didn't have any scenes together with Rush.

Could do. Though who would be the pick for compassionate incompetent? I thought maybe Volker, but that seems a little harsh. Brody perhaps?
There's also Felger & Coombs.
Top middle for compassionate competent would be Jeannie Miller.