They could

Yep

The top two lines and the defense are good enough. Goalie is obviously adequate. Hughes as a rookie could be an awesome 3C or he might not be ready, in which case it's harder to contend, right away.

I guess if Hughes struggles and the third line falls apart, you can swap Kessel and Keller, and move Foligno to center. That way your second line is good enough, with Landeskog and Bergeron making plays and setting up Keller in front of the net, and your third line has some serious offense, too, with Foligno launching breakaway passes for Kessel to race to, and Hughes just off on the side, learning as fast as he can and trying to keep up.

Good fourth line/shutdown line. Between them and Bergeron, you can probably kill some penalties. You might want a couple extra forwards in the organization, but assuming they're just a short drive away, with an AHL affiliate, you're ready to start the season.

This team would..
Win Presidents Trophy
Win multiple Cups
Well done..-~