I agree with Maulfan that it’s more about how the character was written in the movies that make him seem more/less like buddies with Stark. I never liked Terrence, though. I think his acting was downright poor and his line readings were awkward. Chemistry? Shrug. I guess so, but no less than what I see with Cheadle and Downey. There weren’t too many places for Cheadle to really show his friendship with Stark in IM2. However, I thought the Cheadle/Downey banter in Iron Man 3 were gold (I happen to be one of the few that liked IM3!).
Anyway, I’m curious to see how the whole Civil War thing resolves itself. I imagine they will all bury the hatchet in order to fight Thanos together in Infinity War.