I should probably clarify at this point why I say non-impact player. There is far too much talent and ability in Tyreke for him to have as minor an impact on the game as he does. You can tell the big difference in the team when Cousins is on the floor and when he's not on the floor. That doesn't happen enough with Tyreke. There are situations where the coach has benched him for no good reason and he was flowing well, but there are also games where he plays 30 or so minutes and they're not all that memorable. As always, the main culprit for this is how he fades without the ball in his hands and how inconsistent his defensive effort is. Cousins' defensive effort is an issue as well, but you still notice how different the team is without him. Tyreke not so much.
Oh I agree with you on the result, just not so much the cause (which you said was putting him at the point). I think I get what you're trying to say - that he could have had 2 additional years learning how to play off the ball and thus be more effective now, but if we're solely talking about him being an impact player then I still think that he has managed to have an impact 80% of the time when he gets the ball in his hands and is allowed to get into a rhythm. The problem is that doesn't happen enough - and as a result he often becomes a non-impact player.