based on KenPom efficiency ratings. This is true for 3 of 4 #2 seeds as well.
The last time a team ranked higher in defensive efficiency than offensive efficiency won the men's tournament was 2014, when Shabazz Napier led Connecticut and Kevin Ollie to the promised land.
The one team in the top-8 with a better offense than defense?
Purdue. The way they played against Michigan, I could be tempted to pick them to win it all. The way they played against UCLA, not so much.