We must have been watching in different universes. In mine, his 2pt (48 to 41) and 3pt (36 to 34) percent both declined from his 1st year to his last . Rebounds and Assists went up about 1 per 40 minutes. His FT shooting improved markedly, but at less than 3 attempts per game, even the 30% increase he got amounts to less than 1 point a game.
But the numbers don't tell the whole story - he shot more 3s and fewer 2s his final year, so the overall decline in shooting percent from 1st year to 3rd year was 43% to 37%. OUCH.
AT BEST, that's a break even, in my view.
Regarding, "easier to get better if you're not good." Well, Rodney had plenty of room to improve in many areas. He only improved in FT shooting, and, with his style of play, it probably should have been very low on this list of things on which to improve.
As for, "never once doubted he left everything on the court," again, different universe. Kid played hard, mostly, but he'd get lost on D often and get burned. I suppose you can argue that that's not lack of effort. IDK - to me, that's effort. That's not being locked into game mode. Yeah, one on one, on the ball, he was very good.
In any event, I was hoping he would move on after his 2nd season - not so much because of him, but more because I wanted the minutes to go to the younger guys, who had the potential to be around several years. As it turned out, Purvis got a lot of minutes, didn't end up doing much with them, and somebody didn't get as much playing time or as much of a role on the team.
From the island of what coulda been.