The relationship between a team's nonconference strength of schedule and its NET ranking can be less direct than Brownell suggests. There's one league in particular that provides an excellent example of this indirect relationship. That conference is the Big 12 -- last year.
At this point in the season one year ago, the Big 12 didn't rank at No. 32 for nonconference strength of schedule. It ranked No. 9, meaning Big 12 teams collectively played one of D-I's tougher nonconference schedules.
Recall that the league was made up of just 10 teams a year ago. BYU, Cincinnati, Houston and UCF were yet to join the conference.
Nevertheless, seven of those 10 teams were in the top 30 of the NET rankings. The conference was No. 1 at KenPom from start to finish, just like this year (so far).
Eventually, the league put seven of its teams into the field of 68. All of the above occurred in the NET rankings and on the court, even though the Big 12 played a relatively challenging nonconference schedule.
For two straight years with wildly different approaches to nonconference scheduling, the Big 12 has excelled in the NET rankings. It's likely the consistent excellence says far more about basketball than it does about scheduling.