Robert,
Great story about your visit to the Showcase (and your other story regarding your trip to Chicago in general).
It's funny about the Jazz Showcase; I'm to the point I can figure which showswill do well (Holland, Moody, Golson) but there are a lot of great, great musicians that don't seem to pack them in.....Barry Harris is once such musician.
I'm sure the bass player and drummer you saw perform were Eddie DeHaas on bass and LeRoy Williams on drums. Eddie lives in Chicago and usually plays with Barry when he's in town.....he also played with Roy Haynes back in the day (check out a few of them on OJCs). Many times Barry uses Leon Joyce on drums, who I can't handle; arms flying everywhere, not playing anything! LeRoy would have been a few steps up.
Hopefully the next time you make it to Chicago, I'll be able to get into town as well.
Mark