Yeah, the interplay or interaction is key. Heenan had Gorilla or Vince or whoever. Ventura had Vince (or maybe Gorilla at times). JR made Lawler better. That is key to accentuating the heel commentator.
Heenan I really believe is perhaps my favorite entertainer in wrestling history. He was genuinely villlainous, hilarious, serious, offensive, etc...he was a whole package of entertainment.