Semi has the potential to be an insane defensively player because of his one on one ability. He slides his feet so well and he possesses superhuman strength. Great for modern nba defense because he allows you to easily switch pick and rolls. That alone will make him a valuable player.
Now.... to the other parts of his game. At this moment he is pretty awful at everything else and doesn’t give good effort. I don’t care if he is ever a great passer, ball handler, or rebounder but he has to be able to hit his wide open threes. If he can do that, be as excellent as I think he can be playing individual defense, and starts playing a tad harder, he can be a valuable rotation piece.
As someone brilliantly mentioned earlier, he would be a lot more valuable if we actually had a decent scorer off of the bench. Hopefully that is addressed soon and Semi makes the necessary improvements. Going forward, I do believe that Semi can be a guy who plays 24 minutes a game for a good team (which we will be for the next 6 years at least).