Very interesting thread, MG, and I'll probably come back to it again as more things occur to me.
IMHO 5 By Monk By 5 drags in comparison with the master's other Riverside albums. (The critics of Art Taylor on the board will probably point the finger at him.)
In my youth it was put about that Charlie Parker Plays Cole Porter as a very late album wasn't up to his usual standards, and I guess this is true. But in comparison with other artists, everything by Bird is touched with gold and I bought the CD recently and love it, not just for Bird, but for things like Roy Haynes' drumming, too.