I think that, if he has shown to be solid at PG, it's because the kid is a genious: the same reason that explains why Wade is very OK at PG. But I think his natural position is SG. If he can be more effective playing at PG so the other team suffers when pairing deffenses it's another question. But as far as I've seen runing the team, he's not a PG. He is a combo guard, like Wade, like Roy...
Does it really matter? Of course not, as long as Kings win. But maybe it worth start him at SG so he start developing abilities without the ball instead of waiting him to improve his abilities as PG.
I just wanted to touch on a couple of things here.
Stars in the league are stars because they don't have to work off the ball in order to be a dominant player. If you watch Tyreke play you'll see that he doesn't do very well off the ball, but that he excels with the ball in his hands.
Granted it would be good for him to get better working off the ball, but which aspect do you think he should focus his time on:
A.) Becoming even better with the ball in his hands (Shooting, passing, decision making)
B.) Becoming better moving with-out the ball (Getting post position, setting screens, moving with-out the ball)
The first option will make you a better star, the second option will make you a better role-player. I'd like him to get better with everything, but his priority should be to focus on the things which only the stars can do.
If you put a pure PG out on the floor with Evans you basically diminish yourself at two positions. You diminish Evans because you work against his strengths as he won't be handling the ball like he needs to. You also diminish that PG because they'll be playing with Tyreke who doesn't excel in a role where he's a role-player.
So you could combine Evans with a scoring PG, but then you take away the natural mis-match that Evans brings when he plays with another full-sized player.
Whether or not Evans plays like a natural PG, the team is better when he's the primary ball-handler as it plays to his strengths, and the simple fact of the matter is: In the NBA you only win in the playoffs if you have at least one star on your team. So I'd rather Tyreke work on becoming the best star he can be.
One final note: Just because I wouldn't be against trading our best SG in Kevin doesn't mean that my logic is that Tyreke is a SG. I think that Garcia playing the SG is a better fit along side Tyreke playing the PG.
I think a Kevin/Tyreke pairing might work, and I'm willing to give it a shot. But if it doesn't work, that doesn't mean that Tyreke is not a PG, it just means that games that each of these two players did not compliment each other.