Whether we want to believe it or not, Playoff basketball is a different animal.
The things that work in the regular season suddenly become an issue in the postseason. The intricacies and detail necessary for playoff success are something completely different than the day-to-day grind of the regular season.
This is something that players quickly find out in their first runs through the playoffs. The defenses that work in the regular season can get picked apart. Teams that are beholden to one way of playing are ripped from the seams. Teams that cannot overcome even the littlest of adversity fold quickly.