Peja Stojakovic
Ray Allen
Reggie Miller
Rashard Lewis
Rip Hamilton
These players were not stars? Maybe not everybody on the floor needs to be an elite one-on-one scorer? I'm also pretty dubious of this distinction when many of the elite so-called shot creators in the league are nearly as adept at turning the ball over as they are at creating shots for themselves. I don't much care if Keegan could be the star of a different team as the #1 option and primary shot creator, I care if he can be a star player on this team.
Personally, what I want in a star player is high-level defense, situational awareness, efficient scoring, and a wide variety of counter-moves so that nobody can take away their offensive game entirely without trapping or double-teaming, and even then all you can do is slow them down. None of those criteria require elite handles. If Keegan can develop his post game, catch and shoot from multiple levels, consistently make pull up and turnaround shots in the mid range, and continue to perfect his step back three he would have all the tools needed to be an elite scorer on this Kings team, which already has two guys who are top 20 in assists per game every year. If he can do that while also playing All NBA defense, I don't see how anyone could argue that he's not a star player.