After a prompt from Sangrey, I will post about this.
I first met Davey (as he was called then) in the mid sixties when some musician friends convinced him to transfer from Northwestern to the University of Iowa. The reason for the transfer was to replace JR Monterose (soon to depart) in the local club band.
I later ran into Davey in St. Louis at a Mitchell Quartet concert at Washington University, Graham Chapel. The concert was on Saturday, March 25, 1967. Davie was "freakin'". I know his early influnces were Hank Crawford, Oliver Lake, (most importantly) Julius Hemphill and lastly RM. That is what he told me.
For Gene Dinwiddie, I'll rely on my memories.