very deliberate here. He's so skinny and young right now, I wouldn't be surprised if coaches have told him to play good D and to take it a little easy on offense -- don't force anything, don't play aggressive, etc. They are starting him and letting him run with the first team since that is the plan for him in the future, so he may as well get his reps with them, but I don't think they want him going too hard for fear of injury and to cut down on turnovers. I love that he continues to start, though, because it shows the Jazz are truly committed to the future and developing its young talent. Ty Corbin would, no doubt, be playing Trey Burke 40 mpg and probably would have had Gobert sitting next to Jeremy Evans all game long.
Also, Trey Burke seems to be playing better coming off the bench and is given more of a green light to play aggressive on offense (rather than have him start and take away a lot of touches from Favors and Hayward).