Vanderbilt is fine on offense when he has legit scoring threats all around him. He's the type of guy who thrives in chaos, gets you 2nd chances and hustles. You play him when you don't need him to put the ball in the basket.
What he's not is someone who you use this much as the screener in pick and rolls. He obviously can't pop because he's a total non-shooter, and he doesn't have enough size or weapons in the paint to function effectively as a roller. After he screens, he just kinda ends up floating in the middle and clogging up the area, waiting for an offensive board.
Olynyk and Lauri are by far our best screener options because they both can make things happen off pops, short rolls or diving to the hoop. I'd stagger Vanderbilt away from these guys, he should be playing more with shoot-first dudes like Beasley and Sexton in the 2nd unit. When he's not involved in pick and rolls, playing with the starters, his non-shooting on the wing shrinks the floor, making it much tougher for guys to find driving lanes.
On the other side of the ball, Vanderbilt is severely overrated IMO. He has zero discipline as a defender and mostly relies on his hustle and hops. Again, when he's more of a bonus piece and other people are doing the heavy lifting, he's fine. But he has too many flaws to be considered part of the core of your lineups.