Where are you getting that info? I am going on SEC rankings.Those are volume stats, which are skewed to our high-play offense (opposite of analyzing our defense). We were indeed 2nd in passing efficiency. 4th in overall offense. But only 7th in rushing (note sacks are included and a good reason why), so we have room to upgrade. And we did that in spite of a so-so OL performance. It was decent, don't get me wrong. But far from elite. We have room to get much better, as Y2 in the offense will prove.
UT was actually 2nd in rushing ypg vs the SEC. I believe this site also includes sacks... which could mean UT was actually first.
cfbstats.com - 2021 Southeastern Conference Team Leaders
I agree the OL is one big area for improvement. To me, the scheme helped them a lot against everyone but those who just overwhelmed them with talent- UGA and Bama particularly. However I think significant improvement is reasonable to expect. I don't honestly think Mays was a huge positive factor last year. Both bros missed too much time.People have been discussing how we go from 40 ppg to 50. That's where it begins. That and 3rd down conversion and short yardage situations. That's on the OL to a large degree. 44 sacks (124th nationally - though tempo adjusted this is probably more like ~average) is one of our biggest weaknesses (note this offense doesn't have much afa weakness go). That would be my first upgrade point. Take fewer sacks and negative plays and that makes a huge difference in games vs Bama, UGA, UF, etc.
To me, it appears that they came to a point where they essentially gave up on "depth". They went from playing 8 or more guys at WR to basically playing 4. They went from the OL coach saying they were 2 deep plus to actually playing 6 or maybe 7. It seems they just didn't have the time to get a lot of guys ready so they took a step back and focused more on getting fewer guys ready. They've now had a full offseason to fix that. Being able to coach up depth may be a test of this staff.