It probably becomes a zero-sum game around 4 bids. Xavier probably has to knock someone out to get themselves in, because UConn, St. Johns, Xavier and Creighton still have a lot of games against each other. To get 5 teams in, those 4 would have to run the table against Providence, Depaul, Seton Hall and Butler, and no more losses to Villanova are allowed either. And then they would still need to win more than the lose against the other bubble teams.
It is a hard path for all 4 of those teams plus Marquette to get bids.
I think it will the inverse about the SEC. Some of those teams with decent NETs are going to keep losing, and it is going to be hard to get in the dance with whatever a SEC bubble team's overall record will be after it goes 7-11 or 6-12 in conference play. Someone has to lose every conference game.