ISUb's losses to SIU and ISU were not as big of factors as you think last year. As you pointed out, there were plenty of other teams that got at-large bids with worse NET scores and plenty of losses, some of them even bad losses. The difference is that those teams you listed that got at-large bids last year also had some Q1 wins. Meaning they "proved" to the committee that they were in fact good enough to compete with other good teams.
ISUb lost to Alabama, Michigan State, and Drake twice last year. That is why they were snubbed. ISUb did not beat a good team last year. This is now a requirement to go dancing no matter what. If they had beaten either Alabama or MSU they would have been in. If they had not lost twice to Drake I think they would have been in. It is basically the same situation BU is in this year. No chance of beating a good team. So even if we win out, a win over Drake at least once more is the only additional resume builder we have.
I know it sucks the dance works this way now, but that is just how it is.
That just isn't true. Direct from the NCAA website:
The number of Quadrant 1 wins and Quadrant 3/4 losses will be incredibly important when it comes time for NCAA tournament selection and seeding.
It will be very difficult to get an at-large with multiple Quad 3/4 losses without multiple Quad 1 wins to make up for them (both of which are tough for a mid major due to the scheduling). That loss to Illinois state was a Quad 4 loss and SIU was Quad 3 loss. I believe last year Indiana State had only had one Quad 1 win, which those Quad 3/4 losses negated. Indiana State was almost a lock until they picked up that Quad 4 loss. That 100% put them on the bubble which combine that with a high number of bid stealers and they got bumped out.
I know everyone talks about it but NET rankings don't directly correlate to the NCAA tournament selection, it is only for classifying the Quadrants.