Not sure where you guys are looking, but the difference between first and last is much larger than that.
#1 in TD % in the country last year was Northern Illinois at 83.33%
Dead last, #127, was Bowling Green. They scored a TD on 33.33% of their possessions.
Obviously a massive difference.
Also,
@DTP, I don't think what you posted is correct either. Miami did score 26 TDs on 43 chances, good for 72nd nationally at 60.47%. But you're saying just 3 more TDs gets you into the Top 15. That's not right. 29 TDs on 43 chances would be 67.4%. That would have been 37th. Sure, a big jump, but 3 TDs are 3 TDs. That could be the difference between winning and losing. How many games have we lost by 4 points or less the last few seasons? 1 last season, 2 in 2019 (and another by 7 but the game went into OT), another in 2018. Those points could easily be the difference between winning and losing, and I don't think it's a coincidence that the teams in the original tweet who are poor in this metric are some of the worst teams in the country. It's a correlation, no doubt.
Lastly, to get into the Top 15 last year, we'd have needed to score 32 TDs in our 43 chances. That's a significant jump from the 26 we did score.