Well yeah, that's what matters, but he had great chemistry with his teammates and coaches in BOS and had the best season of his career there. They regretted losing him, but no way in hell we're they going to outbid POR to keep him.
He just average 37 MPG in the playoffs with 11.6 PTS/G, 6.2 REB/G, 1.8 AST/G, 2.4 STL/G, 3.4 BLK/G with a PER of 16.2 a TS% of .525 a BLK% of 8.8 and a DBPM of 6.1. Yep, he missed some FTs, as expected, but he did so any other things well he was on the floor for 37 minutes a game and his overall contributions were decidedly positive (BPM = +4.3).
By contrast, Evan Turner played 31 MPG, averaged 10.3 PTS/G, 5.8 REB/G, 3.8 AST/G, 1.8 STL/G, 0.5 BLK/G with a PER of 12.8 a TS% of .512 a BLK% of 1.4 and a DBPM of 5.5. Turner played well in the playoffs, his total contribution was positive (BPM = +2.2), but Roberson played better.
Roberson is a starter. Turner is not. Roberson has a clear cut role - guard the other team's best perimeter scorer. What's Turner's role? Is he a SF, a SG or a PG? You can't play him at SF against bigger SFs. You can't play him against quick PGs and you can't really play him at SG because he can't shoot. He's the classic jack of all trades (well except for shooting), master of none. That's why he isn't and won't be a starter in this league. He's average at some things, below average at some, awful at a few and elite at none. At least Roberson is elite at the 50% of the game when the other team has the ball.
BNM