I have literally watched about 98% of Omri Casspi's games as a pro. I have barely missed a Kings game since league pass became available.
To the person who said he could play the 2-3-4 ... I will give you 3 and 4. Omri playing as a shooting guard would be a mess. Jeff Green is better suited as a 2 than Omri at this point in his career. Outside of his 3 point shooting, Casspi has no other above average offensive skill. He cannot dribble to save his life (very scared to even try, very nervous with the ball). On a very good day he is an average passer, but he does not have good court vision. When he does get the ball near the rim he rarely finishes (shoots it too fast .. again with the nerves) He will finish open dunks though. Layups are not his thing... not alot of touch around the hoop.
His other above average skill is rebounding. He can rebound pretty good for an NBA three. Not elite level rebounding but he is solid there.
Where he really struggles is defense. Just cannot stop anyone. He is an awkward runner, if that makes sense. He is a good athlete, but he doesnt have the lateral quickness you want in a defensive player. Has trouble staying in front of quicker guys and cant match up with the bigger physical players. Its unfortunate, because he does try. He is very competative, but that hasnt translated into good defense yet. Maybe it will, but watching him for two years now I have my doubts.
His shot, while decent (from 3 only, not a good mid range shooter) is very streaky. Recently he has been on a cold streak shooting the three .. so when your shooter cant defend or give you anything else on offense AND is struggling with his shot ... its hard to justify giving him minutes, and that is what is going on right now. Donte Greene is a very streaky shooter too, but he is a very underrated defender and that is why he's getting the minutes right now.
All that being said, Paul Westphal is a nutcase head coach. These roles could flip in an instant. He has one of the most severe cases of rotation ADD I have ever seen. LITERALLY, a player can be starting one game then demoted to 12th man the next night. I've seen it happen multiple times this season.