Offensive line is 90+% responsible.
Our problem is multi-fold. But mostly it comes down to flat-out weakness from our lineman. That shows up in the fact that we can't get any push from anyone not named Gabe Jackson. Even Dillon Day, while he doesn't just get flat out beat very often, produces very little push on running plays. Now granted, sometimes we run zone-blocking schemes that don't ask for that push, but we still have times when we call for push, and we don't get it. Even in the Dak package this year, we struggled mightily to create push. So the "it's the style of offense" excuse really doesn't hold; it comes down to ability/play.
Even more disturbing displays of our lack of physical strength on the offensive line are shown in how many times our lineman get throttled in one-on-one situations. Both on pass plays and run plays, Clausell and Siddoway spend more time on their backs that they do on their feet. (Often) Much smaller defensive ends can bowl them over with a simple bull-rush. The simplest of swim moves not only helps the DE get by them, but sends them sprawling. Heck, Damien Robinson got sent rolling head over heels by one CJ Johnson forearm the other night. And he outweighs him by around 75-100 pounds. You can't play winning football against good defensive front sevens when you can get beat so badly in one-on-one blocking situations.
Look, I don't expect us to have Alabama's offensive line. I'd just like to see us go from sieve to decency. And I think John Hevesy deserves some serious evaluation. We have digressed on the offensive line every year that he has been here. You would think it would be the opposite.