Hmm... just count the wins or something?
Missouri won at Florida. They beat Alabama. They beat Kansas (lol). Those are real wins. And that's not counting against other teams in the tournament.
Georgia got absolutely smoked against Gonzaga...but if you follow the "power rankings" Gonzaga was under-seeded...and their power ranking was as high as it in part because of performing well in losses (to UConn, Kentucky, UCLA, and West Virginia). In conference they lost to Oregon State, Santa Clara, St. Mary's twice. By KenPom, Georgia was the seed they deserved, and Gonzaga should have been a 2. That game is what 2 seeds often do to 7/10 winners. And, look, Georgia looked awful. But... they beat St. John's, Florida, and Kentucky OOC. That's a 1, 2, and 3 seed.
Texas is the shakiest. It would have made a lot of sense to leave them out, but they did beat Kentucky. And they didn't embarass themselves. They lost a 50-50 game to Xavier.
The other "shakiest" team, IMO, is Oklahoma. 6-12 like Texas. But they beat Arizona and Michigan. None of the best teams in conference, but the third place B12 team and the B10 champ.
When you line up their resumes in terms of wins against quality opponents, all of them look better than the bubble teams, except maybe Texas. I think this is a fluke year: I don't think you'll ever see a conference perform that well against top competition OOC again.