DeMar DeRozan is also not on the floor and the team by and large this season is buying into Donovan's style of play.
They're 1st in pace, 3rd in made 3 pointers and they also lead the league in rebounding (Giddey is good on the glass that also bolsters up your defense)
Caruso isn't overrated, the Bulls had much more of a veteran team mindset last season and adopted a play style that was conducive to their best player at the time. You remove that out of the equation and the team plays completely different.