First, the news:
Xavier had been looking to add a game to the schedule after being eliminated from the Big East tournament for a simple and obvious reason: their resume demands it. They're 6-7 in the top two quads and recently added a Q3 loss in the most painful manner possible. No reasonable fan or member of the program is comfortable or even that optimistic heading into Selection Sunday.
While it's disappointing to me that Xavier won't get another chance to add some needed polish to the resume - though not as disappointing as losing to Butler was - this ruling makes complete sense. Even if it were just allowed for a season due to pandemic conditions, I hate the idea of a team's resume not being sealed at the end of their participation in their conference tournament. I don't know that there's a super good reason to feel that way other than the fact that it's tradition, but there you have it.
Now we bunker down for two more days of trying not to let our hopes get rekindled every time a bubble team loses. So it goes. Xavier's resume may be sealed, but their fate isn't quite yet.