Two different schemes not to mention the likely difference in quality of the offensive lines to make a fair comparison. jmo.
Our offensive line really sucked in 2014 but according to Football Outsiders, saw significant improvement in 2015, albeit, from about as bad as bad could be.
In 2013 we had an NFL offensive line - It may be 2018 before we're fully back to that level but we did see significant improvement from 2014 to 2015. 2012 recruiting is the obvious culprit but 2013 wasn't that great either with the timing of the coaching transition. In 2014 we began rebuilding our offensive line with a step change in talent but its generally accepted that it takes 3 years to fully develop an SEC offensive lineman so we still have a ways to go. I think it's telling that the left side of our line is populated with 2014/2015 recruits while the 2013 guys are starting on the right. Jones & Hall (2015) won rave reviews when they took over the right side last year but I think there are seniority issues to manage with these kids so we're starting out with the older guys on the right again. I also think Richmond is having to step up at least a year ahead of the ideal timing so he still has a ways to go in his development. That said, I still don't expect him to be the weakest link. For now that will still be on the right side, imo.
Still, we did see a lot of improvement in 2015 over this position group's 2014 performance levels. The only area we regressed in was passing downs rush yards. Maybe we should pass more often on passing downs - that is, unless there's that much more faith in our rushing attack than in the passing game. Statistically, our 2015 line actually beat out Alabama (National Champion) in a couple of categories, Standard Down Rushing Yards per Carry and Passing Down Sack Rate. We improved and they regressed in 2015 but even with their regression in those areas they were able to overcome their significant deficiencies and still win the SEC and National Titles.
Even though in 2015 we gave up more TFLs (not including sacks) than the prior year our Stuff Rate (# of times RBs are stopped before getting back to the LOS) improved significantly, from a 96 ranking to 55. The areas that improved the most were our Power Success Rate (Running on 3rd or 4th Down with 2 yards or less to go for a 1st down or TD) and our Passing Down Sack Rate (We were much better than Alabama on this - Probably owing to some extent to the mobility of our QB).
What I'm hoping for this year is that we get another significant reduction in our stuff rate, that we reduce the number of TFLs we allow (#111 in the nation last year) and further reduce our standard down sack rate. The stuff rate reduction could possibly add as much as 10-20% or more to the yards per attempt for our RBs. If that happens it will become increasing obvious to everyone else outside our fan base just how good Jalen Hurd and Alvin Karama really are.