While I can not add to your list, I believe it a championship aspiring team requires at least 3 players who are above-average in three "positionless" roles.
For example, I'll compare OKC to LAC
Durant- Spot-Up Shooter, Slasher, Perimeter Stopper
Ibaka- Interior Presence, Rebounder, Low Post Scorer
Westbrook- Ball Distributor, Slasher, Perimeter Stopper
Harden- Spot-Up Shooter, Slasher, Ball Distributor
Paul- Ball Distributor, Perimeter Stopper, Slasher
Griffin- Low Post Scorer (is the only one I am certain of though I guess "Athletic Freak" might be a "position" of sorts)
D'Jordan- Interior Presence, Rebounder
Billups- Ball Distributor
Whats intersesting about this kind of anylsis is that it shows how teams can win with multiple players possessing overlaping roles in the case of OKC, as long as they are pretty good at said roles. This also means you will need more specialized players to make up for the defencies the main players lack.
Concerning the Hornets, we already have one player in Gordon, and another expected in Davis. Anderson could be the third if he keeps up the pace he set last season. This means that we need to find at least one more player to complete our "Main Men" assuming the other 3 pan out at best-case scenario (Gordon stays healthy, Davis doesnt pull an Oden or Kwame Brown, Anderson plays like he did last year.)
Obviously Rivers stands the best chance to become the fourth guy being he has the most pormise after those three.