I emailed directly about this very issue a number of years back and got no response.
Wellman is one of the greatest groove players in history, you only have to listen to his work with Miles to appreciate this.
He was with Chuck Brown and the Soul Searchers before joining Miles, he's essentially the godfather of the original Go Go groove, and the guy Miles replaced Al Foster with.
Check out the following:
intense driving groove.
Human Nature - Paris 91, turning up the heat gradually, wait for it.
Hannibal - 1990 Montreux, deep pocket
Vote for Ricky!! : )