Dellevedova had the highest +/- of any player on the team last year other than Zizic and Henson (very small samples). With Delly on the floor the Cavs outscored their opponents by 8.4 points per 100 possessions. He makes the players around him better through his intelligence and good decision making. And this was a season where his 3-point shot wasn't dropping because he was working on a new stroke. He missed a lot of wide open threes he was making in previous years. His 3-point percentage was 23.1%, down from a career average of 36.8%.
In terms of five-man units, the Cavs' best lineup last year (minimum of 100 possessions) was Sexton, Delly, Cedi, Love and Thompson. That unit outscored opponents by 11.0 points per 100 possessions (the Cavs averaged 102.4 possessions per game).
There was an interesting lineup of Sexton, Delly, Love, Nance, and Drummond that outscored opponents by 33.3 points per 100 possessions. That lineup was only on the floor for 33 possessions but we could see it this year if they bring back Delly.
That lineup had a huge front line but there was also a small lineup of Sexton, Delly, Porter, Love and Henson that outscored opponents by 13.3 points per 100. That sample was 27 possessions. Put Drummond or TT in for Henson and we might have something.
Getting back to Drummond, the lineup of Sexton, Garland, Cedi, Love, and Drummond, which could be our starting lineup to begin the season, was a -34.5 per 100 based on 109 possessions. That lineup was awful. Overall Drummond was a -16.1, by far the worst on the team. However, part of that may be due to joining the team in mid-season.
In 2019-20 the Pistons were a little better when Drummond was on the floor by about two points per 100 possessions. But his usage rate was in the 94th percentile, meaning he dominated the ball on offense. Drummond's points per shot attempt was in the 28th percentile. A lot of shots, not a lot of points. Part of that was due to him being a bad free throw shooter. Also, his turnover rate was extremely high placing him in only the 11th percentile.
Last year Drummond made 54% of his field goal attempts which is right on his career average. But since he rarely shoots 3's (and made only 28%) his field goals are only worth 2 points. When he's fouled he makes only 58% of his free throws which explains the low points per shot number.
In the 18-19 season Drummond was outstanding for the Pistons. They outscored opponents by 11.1 points per 100 when he was on the floor, placing him in the 96th percentile of centers. With Drummond on the floor the Pistons were in the 99th percentile in points per possession and the 94th percentile in offensive rebounds. Defensively they were average. The Pistons finished 41-41 with Drummond averaging 17.3 ppg, 15.6 rebounds, 1.7 blocks, and 1.7 steals.
If the Cavs can figure out a way to use Drummond's skills within the concept of what they are trying to do as a team (which Detroit gave up on trying to do) he could be a huge contributor. But it will probably involve him handling the ball less and taking fewer shots than he would like. I think the hope is that at this point he just wants to win and will accept whatever role Bickerstaff has in mind. If not this will be his last year in a Cavs uni.