I agree, Enhance, and generally, I have not gone after Cav's decisions this past season. My bigger concern is that he stated that his policy is to not substitute, regardless of the abilities of a back up. He has said that and compared his approach to the NFL which truly does not rotate.
So while I won't second guess his decisions about who should start, I do have doubts about that sort of policy.
I would simply say too that it's ok to second guess some of these decisions. Like him or not, Cav has a very thin resume in terms of running successful OLs and being part of successful offenses. Not that there's nothing there, but more like he's still in "prove it" territory.