Yes jarel can definately be viewed as part of the same thing. He even namechecks Madlib on 'Three Piece Puzzle'. Waajeed is another producer who can be included, especially his instrumental stuff.
I think one of the most important 'wonk' tracks can be traced back to Dilla's remix for DJ Cam:
Not sure when it came out tho
the shape of broad minds is good, not so sure about his beat stuff, it's quite straight up beat copping.
dunno that cam mix - nice!