I saw Alex Foster with the Mingus Dynasty Group (Jack Walrath leading) back in, I think, the early 90's, and he was pretty great. He's never reached me on record the way he did live that night.
I've wondered about Alex Foster on those albums... His best moments are amazing... But he also comes across as someone who know exactly how to respond to "let's play this as a slow bounce with a samba backdrop in sixth"... And in many ways it's great that he knows his craft... But maybe, from time to time, it would have been even better if he would have said "I don't know how to do this" with the subtext of "I know exactly how to do this but what an awful idea"