1) Everything I heard about Ayton was he is an uber-athletic big man. I'm not convinced that I have seen this from him yet. The most telling moment for me in the bubble was watching him get beat down the floor by Boban in the Dallas game. I think he needs to tone down his lifting for bulk and replace it with huge amounts of cardio. Giannis is closer to 240 pounds at 25 years old while Ayton is 250 at 22 years old. Both are 6'11" tall. I think losing 10 pounds and focusing on cardio will allow him to play with more energy (motor). Getting to 240 would allow him to jump higher, run faster, and play more minutes. If he is an uber-athlete he should be able to run like a gazelle beating most other big guys down the court. I don't think he can do that at his current weight. He needs to start now on a huge cardio program that doesn't kill his knees but has to be some type of repeated short sprints. The will/desire to move without the basketball is telling.
2) He needs to refine his pick-n-roll game with both video sessions and on-court training. He should be watching tape of Amare, Karl Malone, and some of the other masters at pick-n-roll. Sure they had Nash and Stockton to facilitate but he should be able to run it with Booker and Rubio. Part of this goes back to his fitness and being willing to roll hard which I haven't seen from him yet.
If he can master these two areas for next season I could see big improvements in his points, the number of free-throw attempts, blocks, and even his rebounding numbers. I would expect 24/14/2.5 and 5 FTAs per game.