I'm late with this point, but here goes.
Stevens has not used much in the way of bench minutes for three seasons at least. Didn't have much of a bench, thus no surprise here. I usually jot down the bench minutes.
Celtics 84 minutes and 34 points
Bucks 73 minutes and 12 points.
If the Celtics bench got 70 minutes last season it was rare.
Stevens, over time, will be happy with a 7 man rotation.
Again, if there isn't a good player on the bench? Nothing can be done.
My point is that if Smart, Tatum, Brown are going to each play 40 minutes a game in a playoff series it becomes a factor.
Legs are legs and shots are shots and I'm sure their stats freaks have looked at this.
If the guy you are up against is fresher that can have an impact.