Good description. I think it has something to do with the absence/presence of pianists. A busy pianist will clash with Davis. Hank Jones on Elvin's LP plays sparingly, almost like a third horn, and it works.
People said about Roach that he did the piano player's comping on the drums. That, with a strong bassist, doesn't leave any room for a pianist. Roach does the rhythmic part of the comping, Davis the harmonic part.