Kai still needs just a little more improvements. Footwork, toughness and shooting percentage. Big men who does not have any guard skills today does not usually work in the NBA today. If you noticed how dominant Dwight Howard was in late 2000's, but now he's became irrelevant and he even considered retiring as no teams would allow him to play his usual minutes. It was reported that he does not want to play in a smaller position. And, not it's not like it is because of his injury too. He literally bounced back though it's not 100%.
Chet Holmgren and Victor Wembanyama is also one the main reasons why Kai did not make it in the recent draft. I'm confident he'll make it next year, I hope he's not gonna quit on his dreams.