Mac, BYU was dropped specifically because they had to find a place for them to play Thursday/Saturday.

http://espn.go.com/mens-college-bask...ote-final-spot

"Another problem in bracketing was having to accommodate BYU in a Thursday-Saturday regional if the Cougars win the first round game in Dayton against Iona. BYU's policy against playing athletic events on Sundays forced the Cougars and Iona to No. 14 seeds -- the lowest at-large seed ever in the NCAA tournament, Worlock said."