I think it was 2 and 3. For every great team, there's probably a play style uniquely designed to give them problems. For Gonzaga, it was a really physical, aggressive opponent. They were also probably a bit mentally drained from their win the other night.
To win a title, I think you need to avoid whatever your Kryptonite is. For example, in 2015 Duke didn't have to play a single team that was really great at attacking in the pick and roll.