In Regards to drummers:
Matt Cameron (Soundgarden)
Bud Gaugh (Sublime)
Lucky Lehner (Circle Jerks)
Squirt (Choking Victim)
Adam Zuckert (F-Minus)
Brendan Canty (Fugazi)
Zach Hill (Hella)

Bassists:
Eric Wilson (Sublime)
Robert Deleo (Stone Temple Pilots)
Matt Freeman (Operation Ivy)
Karl Alvareez (Descendents)

The other two members of Primus?

I really don't think Matt Freeman or Zach Hill are overlooked at all.