If they lose their top2 C's, I think they're probably a wild card competitor. Bergeron is the straw that stirs the drink there and they don't have a replacement Captain who can do what he does. It's probably McAvoy for them and no doubt he's learned a lot from Chara and Bergeron, but I agree that going from Bergeron to Zacha as 1C is too much for a team to weather in addition to losing their central pillar and best player.
Bruins are a defense factory, probably the best in the league at it. They always pull some prospect out of college that they drafted in the fourth round three years ago and put him on the 2nd pair. Drives me mental. Tampa's pretty good at internal development, always pulling out a forward and a defender out of their system and turning them into contributors. Who the heck is Perbix??
See below for more comments on Tampa, I think they're going to be just fine and will probably improve due to their main guys getting an offseason to recover. They're a modern dynasty with the core still intact, they're a huge threat. Our Leafs have built an offense around four guys for the last half decade and been close to the top of the league in scoring, the Lightning have done it too and can absolutely do it again this year.
Hagel had 64 points last year and has another year on his deal, and Cirelli is a two-way force and a core piece. Losing Killorn is absolutely a blow to their depth, but if you're going to bracket (points) you might as well point out that losing Ross Colton (32pts) and Corey Perry (25pts) isn't going to break them.