None of those teams are serious contenders, but yes I missed them. To get there, Duke had one of their slowest teams ever. Xavier...not a serious contender and likely not Oregon. Butler is one of the fundamentally sound teams ever. Fran's teams aren't. Therefore the PG covers a lot of weakness.
Before your time I guess, Ronnie Lester and Kenny Arnold made Special K, Steve Waite and Kevin Boyle look like world beaters. Sound D starts at the top. Baylor which isn't great will expose SC. Butler has had an easy road as had the Ducks.
I get what you are saying. Possible? of course. A serious contender? I think back to the 06 Iowa team. Tough as nails PG? Yes. Results? That was Iowa's last realistic chance to do damage in the dance.