Even beating the zags twice won’t help us as much as it hurts them. They’d move zags down before they move BYU up. Upsets in ccg doesn’t usually result in 2-3 seed bumps.
BYU fans need to hope for either a 7 or a 10. If they get an 8-9 then they draw the hottest team in the country in second round in Baylor.
In your scenario 4-0 means a 6 at best.