There is always a difficulty in reading raw ratings data because we don't know network or how much was on simultaneously. I suspect Big Monday outdraws games later in the week because there is not a lot of competition on Mondays.
Digging deeper into the data, something looks wrong. The Big 10 dominates the list, which would not be shocking by itself, except that Minnesota is a Top 10 ratings winner, and there are not nearly enough Big 10 games represented in the list. So I suspect that only certain networks, such as ESPN, CBS and ABC, are included. It also doesn't reflect the relative value of certain markets. How much is a .8 with a heavy NY viewership worth compared to a .9 out of Missouri?
The Big 10 gets a lot of CBS and ABC, which will drive their numbers. If the BTN is left out of the numbers, it is artificially putting the Big 10's best foot forward without dinging them for the mid season Illinois/Northwestern matchup on the BTN that draws a .1.
The Pac 12's numbers are atrocious, as they always are when any kind of ratings analysis is done.