Yeah, I mean -- if Rob could play 36 minutes a night, in theory he would average something like 15 points, 12 rebounds, 3.5 assists, 3 blocks, and 2 steals, on 70% True Shooting.
I assume it wouldn't be nearly that fantastic, but even if he was a few shades less brilliant than that, he'd probably look a lot like, say, Clint Capela, if he were able to play full minutes. Capela is a valuable player, but nowhere close to being a star.
Of course, there's a huge difference between playing 16 minutes a game and playing 30-32 minutes a game. Availability is a huge issue, too. Rob has only been available for 30 games so far this season, after averaging about 30 games his first two seasons.