Are you serious? They just won the cup and made it to the finals 2 years in a row.
If there's a team that can just decide to turn the switch on once the playoffs start, it's them. Just like teams like Tampa or Pittsburgh during their great years.
Like I said, I really feel like they will do just enough to win the division. If they get caught by Toronto or Tampa, they'll start playing with some urgency and go on a winning streak.
Also, I think it's a "calculated" risk to take some nights off. In the worse case scenario, they'll finish 2nd or 3rd. It's not like they could miss the playoffs.