You would think all teams have to deal with a number of back to backs, injuries, personal issues that never get reported, and a bunch of other stuff over a season. Some teams complain about it, other teams just go out and win.
This is actually proven to be incorrect.
Good teams don't "just go out and win" in back to backs, they're terrible in them aswell.
A lot of teams with A TON of talent doing much, much worse in the second half of back to backs vs rested teams.
The leading theory here(not a conclusion, just food for thought) is that it's harder to implement skill in back to back games when you're tired as it is to implement grinding style hockey.
That's why the teams at the bottom of the list will look the same way on either night because they don't have a ton of skill throughout the line-up.
Where as the top teams in the league that need their stars to come through i.e Jets, Leafs, Caps, Bolts, Canucks, Rangers, Flyers, Penguins, Bruins are all much worse because those teams win on talent before they win on good ol' Canadian hockey.