In 2015-2016, Collins’ third season, NU went 20-12 and 8-10 in the conference which was as solid of a season as any during the BC Era or before. However, due to new NIT rules making it mandatory for teams from mid-majors who won their regular season title who were upset in conference tourney receiving automatic bids, NU did not receive a bid.
This is the second time you've stated this and this is the second time I will point out that those "new NIT rules" were put in place prior to the 2006 season and were therefore in place for all four of BC's NIT teams. NU missed the NIT in 2016 because they played a laughably terrible schedule and didn't beat anyone with a pulse. Mid-major auto bids had nothing to do with it.
During one BC season, NU was 8-8 in the conference, but benefited from Indiana and Iowa being down due to issues. I believe Indiana’s coach Kelvin Sampson was fired due to recruiting violations and the program was in bad shape.
That was 03-04, and while that was indeed the weakest year for the conference in recent memory (until this year), and Indiana had their first losing season in decades, Mike Davis was Indiana's coach. They were still two years away from hiring Sampson.