I don't know either, but I believe position coaches have a big say in who gets recruited at their position of responsibility. So Hiller bears some responsibility for which linemen are in the program as well. I've recently looked at some of the OT film of Teven Jenkins who the Bears drafted as well as analytical stuff on his technique and then looked at Caleb. On pass pro, that requires more natural athleticism, Caleb may not have the athleticism required but technique improvement might help at least a little. He's got the size that ought to translate into great run blocking at the least, and it doesn't. He doesn't pancake anyone, and he doesn't really move anyone much, at least not last season. So my view is Hiller is not coaching to Caleb's obvious advantages (size and run blocking) and maybe isn't even maximizing his potential on pass protection through technique improvement. I hate to specifically point to Caleb though, as the other linemen last year were equally disappointing. Bedford did take a step back when he moved to the right side. The interior linemen offered pretty much nothing other than large bodies in the way. Penix and IU were fortunate he has such a quick release because otherwise the offense would have been pretty bad.
The other point to keep in mind is by last count, the IU roster has 22 players listed as 0-linemen. Five start, probably eight play the majority of the plays. What does the line performance of the starters say about Hiller's ability to manage a position group to competency or better? With 22 players he can't find or coach up five that can perform better than the guys we played last year?
Again, Hiller should be on a contract year, his line performs better or he goes.