I got the CD.
First, my apologies to the drummer. His playing is not at all pedestrian. The drumming sounded intrusive on the radio, but not on the CD. Not sure why.
As for who the drummer is...
The announcement which I have heard and definitely says Huss Charles is not included on the CD. It is 74 minutes so space was not an issue.
There is no mention of how it was decided Denis was the drummer and not Huss but the possibility that it was Huss is not mentioned at all. Bernard Drayton does suggest that Denis was one of KD's guys but what does that mean? Did they gig together a lot? How much gigging did KD do at that time? He had health issues and was barely recording. Finding proof of this claim would involve a deep dive to find gig listings. Very labor intensive. Using RIPM Jazz would help, I think, but I have yet to see it in action.