I question your assertion that Jordan Hill can actually shoot. Last year he shot 50% from 10-16 feet, but that was a) on only 81 attempts, so sample size matters, and b) his prior best was 41% from that range, and he's under 40% career on those shots. He's even worse the further away from the basket. When Jordan Hill takes a jumper, the defense has won.
He's a solid rebounder tho, that point I will absolutely concede.
Well, then, I've got to contest.
First things first, "being able to shoot" is subjective and relative. 41% on midrange in game is nothing to scoff at unless you're Kevin Garnett or Dirk Nowitzki. I wasn't trying to compare him with Kelly Olynyk, but compared to all the other back-up Centers, I'm sure it's up there. And compared to other available back-up PF/C who can rebound and have proven themselves, he's probably the best.
Secondly, 50% on 81 attempts isn't the smallest sample size. In today's NBA, 81 attempts from 10-16 feet isn't insignificant, especially considering how much the game has shied away from that shot.
If you want a larger sample size, on total jump shots between the 3pt line and the paint,Hill attempted 185 shots, making 40% last year.
http://vorped.com/1-nba/2015-2016/player/894/jordan-hill/shotchart/On the flip side, you can compare Hill's 57% on 315 shots in the paint vs Jerebko's 48% on 117.
But regardless, it's not about how well Jordan Hill draws defenses, it's about his energetic rebounding making the 2nd unit better as a whole. He DOES shoot which proves he CAN shoot, and defenses won't leave him. Maybe Isaiah and Brad's spaced/movement offense gets him a lot better looks than he was getting.
Finally, it doesn't really matter if Jerebko or Amir are slightly better shooters because they're not shooting threats anyway. Teams aren't going to change their defensive plans vs. us one iota if we replace Jerebko with Hill.