What it would seem like, at least at face value, is that Ayton has struggled to adjust to CP3 more than most on the team. That would be what it seems like just by looking at numbers. Maybe to some it seems like he is loafing more this year than last, and maybe that is the case. The question would be why. Is he lazy, or a bit confused with a new leader and pace, or maybe his THC levels are elevated?
It did seem like he was more comfortable last year with Rubio and the faster pace of the game. The Suns have slowed it down considerably this year and are passing a lot more. That makes the half-court offense more complex with more decisions for every player to make in each possession. Ayton's size and athleticism are off the charts, but his bball IQ is closer to average. He is surrounded by players with much more in the way of bball smarts than he has--CP3, Book, Bridges, Kaminski, Johnson, Crowder, Saric, and even Payne are pretty heady players. Ayton obviously is taking longer to adjust.
I prefer to think this is the problem rather than just motor, but I am speculating.