While I do agree that without JPP, we don't make that EE, I also believe that he was overrated by our fanbase for his entire career. Still, with our sketchy history of transfers, he'd have to be up there on the list.
Though Bobby Maze played as a freshman at Oklahoma, he went JUCO before signing with Tennessee. Not sure if you were just mentioning his inclusion on that Tennessee team in a general sense, or insinuating that he belonged in the transfer discussion.
Scooter McFadgon is another who made a huge impact statistically, but is often forgotten about because it goes back 20 years. Averaged 16 pts, 4 rebs, 2 assts across two seasons at Tennessee for a couple of below average Buzz Peterson squads, so his brief tenure was pretty forgettable.