One thing Dudley would provide is outside shooting. He's a career 40% 3pt shooter. The downside, if you want to look at it that way, is that he seldom attacks the basket, with around 80% of all his shots being jumpshots, and only 10% of his shots at the basket. But the dude can shoot the rock. Defensively, I wouldn't call him a lockdown player, or even someone I'd rave about. The plus/minus is slightly in his favor, so he's not a liability there either.
It should be noted that he's most successful when playing SG instead of SF. But then, he's played at that position more than SF. So he's someone that would help our outside shooting, but I'm not sure he's the defensive player we're looking for. I'm also not sure why the Sun's would want to trade him since they just signed him to a long term, and very reasonable contract. If I'm the Sun's, I'm not trading him for Jimmer. One is a proven player, and the other isn't. So I doubt he'll be wearing a Kings uniform anytime soon.