Syracuse was bad defensively last year. The years before that Syracuse was 63rd, 31st, 31st, 6th, and 24th in defensive efficiency. I doubt there are five teams in the country that had as good a five year run as Syracuse. People have good games against man defense, bench warmers hit six three pointers against man defense, teams play man defense and lose to inferior teams all the time. (You'd have to go all the way back to earlier today to see a number one team playing man lose to an unranked team.) none of this is specific to the zone, and the numbers show pretty definitively that syracuses zone is as good as anyone else's man (given the personnel).