Baylor does still have to travel to Iowa State, whom I consider a better team than Texas, even though Texas did just beat them narrowly in Ames.
If Louisville beats UConn, they'll have inside track on a #1 seed, and UConn will very likely fall to the 2 line.
There's certainly room for a Pac-12 team and/or Mississippi State to grab a #1 seed. The top Pac-12 team may suffer an extra ding or two along the way, but their resume will still be *loaded* with top-25 and top-50 wins. Also, both Stanford and Oregon already have a better win (Baylor and MSU, respectively) than Mississippi State can possibly have. Even if MSU ends up with only 1 loss, their best win will have been over Marquette / South Carolina / Kentucky.