But it isn't the rating vs the median team (i.e. the #177 team), but the average, and the concentrated talent at the top theoretically pulls up the average just as much as it would if distributed across more teams. You could argue that top teams stash some of that talent on their bench, but NIL is keeping more good players in college for longer, so who knows whether it shifts things one way or the other.I mean it takes offensive production and then rates against the average team(the mean) from that season. To predict how each offense would produce over 100 possessions against the average opponent.
It still doesn't work as a comparison across years. If talent consolidates at the top and the average team has less talent compared to the top than previous seasons than you will see higher o ratings from that team.
There are 354 division 1 teams. When the talent condenses and the power schools naturally take the best players from small schools every year, it makes perfect sense that the efficiency gap between them would grow.