They could/should let the top 4 seeds host. If someone's arena is small, let the school move it to a nearby bigger venue if they want.
Goal here would be to maximize attendance and atmosphere and rewards the best teams.
Matchups giveth and matchups taketh away. Went to both NDSU/UND games this year. NDSU is a better team but teams lose to lesser teams all the time.
The only result that would surprise me is if UND won comfortably.