Interesting illustration, never saw SOS displayed that way before. One thing that this makes clear is how rare it is for upset victories. This is the thing the Franklin haters like to harp on but as seen here nobody is winning those games. The only reason Franklin has so many is due to tenure, coaches of most of these schools don't last for 10 years to accrue the same poor win % as an underdog against ranked and top 10 teams.
I'd probably group teams into tiers in this illustration, both by current team performance and maybe by expected or historical performance coming into the season. Historical Tier 1s would be OSU, UM, PSU, USC and maybe Oregon, although I might consider them Tier 1b. I fully expect that some of the bottom teams would end up playing more games against top tier conference opponents simply because the top teams most likely told the Big 10 they will not accept playing more than 2 such games in a season unless all of their peer programs also have to do the same in order to level the playing field. The easiest way out of that argument is for the Big 10 to limit the top programs to a max of 2 or 3 games against tier 1 opponents per season. It's also in the conferences best interest to do so, in order to best position their tier 1 programs to make the playoffs which is the exposure the conference wants and brings in more CFP allocation money.