Which has happened how many times in NFL history?  ONCE.  And that's because they played one of the worst opponents in SB history.  Very, very, very unlikely, no matter how good a defense is. The Broncos dominated on defense on Sunday (230ish yards, 3 of 12 on 3rd down, etc).  How did that work out?  You have to have at least some offense.  Trent Dilfer is like Joe Montana compared to Siemien.