Just for ****s and giggles...I did a different comparison. In the 2012-13 season, Parsons didn't have Dwight Howard (a low post threat to draw double teams), and Gordon Hayward had better talent to play with (Big Al and Millsap). Here's how the numbers compared:
Parsons: 15.5 ppg, 48.6% FG, 38.5% 3PT, 5.3 RPG, 3.5 APG
Hayward: 14.1 ppg, 43.5% FG, 41.5% 3PT, 3.1 RPG, 3.0 APG
Still...Parsons put up better numbers than Hayward (without Dwight Howard). In fact, Parson's numbers went down this season compared to last, so having Dwight Howard on the team didn't help him statistically.