I am not really qualified to answer. My opinion is the"system" thing is over blown, especially by our opponents.
Different teams have different blocking schemes but I think the position is pretty much the same. The linemen are evaluated on their size, athleticism, strength, footwork (nearstep, playside step, drop step), their base (inside the shoulders, outside the armpits), how well they use leverage (physical and positional), how they manage their angles, how well they read the defense (the right guy picking up LBs, etc.) and whether or not they're all on the same page. An offensive line has to play with one set of eyes (not five sets). There is only one way to block a play. It's not the right way and it's not the wrong way; it's our way. This is true for any team. One half side of the line could be zone blocking and the back half could be man blocking, it just depends on how that play is designed. It is said that offensive line play is not natural (I assume the footwork part) and that's why it takes a while to get down. You sort of have to think it through to understand how bad footwork even if only occasionally will make the lineman vulnerable and give the defensive guy the edge.
Last year at this time I was wondering how or who we would get to replace Velus Jones. VJ's average depth of throw was about 7.6 yards or so; over 70% of VJ's receiving yards were yards after catch. He was dangerous with the ball in his hands. I figured Hyatt would be the guy but I thought Calloway was the one more like VJ. I've seen "experts" say that Hyatt is the best deep ball receiver in the draft. There's no one better. He's the best. If you throw it to him short he's not really going to do a lot with it. Less than 40% of his yards are YAC; most of his yards are air yards. That's both Heupel and Hooker. That's just the way it is. jmo.
Back to offensive line. From the long time OL coach of the Patriots, he says if you're not seeing your practice drills on game tape then you're doing the wrong drills. I've started watching our OL drills on the short clips we get from practice and then watching our games. I slow down the video so I can see the OL better. It seems to me we're doing the right drills. It's a thing of beauty when the OL is playing well. They say if you keep your hands inside on the pecs of the defender you won't ever get called for holding. If you reach, bang, holding. The idea is to control the defender with your upper body and push them around with your lower body.
By my analysis we had the 2nd best OL in the conference last year, behind Georgia. That includes run blocking and pass blocking. On the whole we were really good. I looked at our performance game by game. The Georgia game we didn't do so good but overall the OL play was critical to our offensive success last year. They weren't penalized a lot. Overall our defense was penalized much more often than our offense. Mincey (new guy last year) was the most penalize guy on the OL; Hadden was the most penalized guy on the team. Experience is critical on the OL but maybe just as critical if not more so is coaching and we seem to be doing good on that part. jmo.
72 pressures allowed was the lowest in the conference last year. Alabama gave up 129, so did Ole Miss. A&M gave up 159. SC was at 113 and UF was at 121. UK was at 107 but they also gave up the most sacks at 46. LSU gave up 45 sacks. (Pressure stats are from SECSTATCAT).
*Note: I would attribute our low passer rating in the Vandy game to the weather, not to their defense. jmo.