I'm going to have to say the growth and emergence of Danny Granger.... followed closely by Dunleavy's own breakout season.
I'd accept flip-flopping those two names or just making them 1A and 1B. I'm not sure anything else comes close to the brightspot they've been this season.
Both players have played themselves into solid roles with the team plus I'd have to think have increased their marketability should the team desire to split them up to shore up another area. Not only that, but I'd say they might've played themselves into TPTB rethinking their original plans for the team.