Ariza is a better pickup when you already have a ball-dominating SG in the form of James Harden, especially when the SG hardly plays any defense. Parsons needs the ball in his hands to optimize his impact, but Monta also needs the ball, and that's exactly the reason why he somewhat underperformed in Dallas imho. I fathom that Parsons will have a better season in 2015-2016 with better chemistry and the departure of Monta. I never said Parsons is worth 15m/yr, something between 10 and 12m a year sounds like the right price for him, but in today's market you tend to overpay for everything, it's the seller's market tbh. Parsons doesn't rely on athleticism so that injuries and the loss of athleticism wouldn't be as much an issue to him as it would be to Lebron type of players imho.