This tool has popped up a few times in threads over the past few years (most recently by YoungMUFan4 (https://www.muscoop.com/index.php?topic=62910.msg1425873#msg1425873), but it was new to me: Mess with the game winners, hit calculate, see the tourney bracket outcomes.
https://bball.notnothing.net/bigeast.php?sport=mbb
I've been playing with this for the past 20 minutes. Talk about a tight race between the top few seeds.