Gonzaga beat Oregon by 9 points and lost by 40 to Michigan. They haven't played an opponent with top 25 offense and defense since November. Their league doesn't include a single team with a top 50 offense in the country. They almost lost two Quad 3 games in the last 2 weeks.
Saying the Zags are "bad matchup" is innaccurate.
Potential top 4 seeds that would be bad matchups for Nebraska include the following:
Arizona
Duke
Florida
Cockeye State
Virginia
Vanderbilt
Illinois
Michigan
I might add KU to the mix if Daryn Peterson can actually prove to play a whole game. Of those teams, Florida is the streakiest. They can beat any team in the country, and also lose by 20 points. Virginia's offense is like the Anti-Nebraska Kryptonite. Vanderbilt is a smaller version of Illinois. Cockeye State is just relentless.
Potential Top 4 seeds I think Nebraska can beat, if the Huskers are healthy:
UConn
Houston
Michigan State
Gonzaga
Kansas, if Peterson is only playing 15 to 20 minutes
Purdue
BYU - honestly think Dybantsa is halting their offense. He is immensely talented, but they pass up so many open looks just to watch him drive to the hoop. That will hurt them in March.
Louisville - if they get healthy they might be the best team in the ACC.