Winning in January and winning in the postseason are two vastly different things.
As the snow melts away and things start to heat up, it takes a different style and makeup to win.
Teams can slide through the regular season, putting up a handful of impressive wins. That will be enough to get a bunch of teams into the final 16, but from there, things get tight. There are no easy wins in the postseason, and only teams that are built a specific way will have further success.
Teams that win in the playoffs play defense. Not selective defense, but tough, physical defense from the introductions through the final horn. Still, even that isn't enough.
Successful playoff teams also need an individual player who is capable of dominating offensively. Other factors find their way into the formula as well. Teams that are experienced, confident and well-coached will, more often than not, find themselves deep in the postseason.
A select few teams are able to pull from all these factors.