Letang has played a big role in Pittsburgh's turnaround with 37 points (10 goals, 27 points) in his first 40 games this season. He had 51 points (nine goals, 42 assists) in a 2017-18 season full of defensive lapses after returning from undergoing neck surgery the week of April 13, 2017.
Several other players are worthy of mention. Crosby had 13 points (three goals, 10 assists) in a six-game point streak that ended Sunday; Jake Guentzel has 10 points (five goals, five assists) in his past nine games; Phil Kessel has 11 points (three goals, eight assists) in his past seven; and Bryan Rust scored eight goals in six games from Dec. 12-20.
But the biggest difference between November and January is the health and strong play of goalie Matt Murray.
Since returning from a lower-body injury, Murray has won each of his seven starts with two shutouts, a 1.27 goals-against average and .952 save percentage. Before that, Murray allowed at least four goals in each of his six previous starts (0-4-1) and surrendered three goals on 10 shots before being pulled after the first period against the Ottawa Senators on Nov. 17.
Murray said he is aware of his improved performance but chose not to specify what has changed.
Sullivan went into more detail.
"When you can stack a few games together like he has, and played as well has he has, it has to build his confidence," Sullivan said. "With that comes a whole different demeanor. I think, right now, he exudes so much confidence. He always has a calm demeanor in goal, and that's the quiet confidence [he has] when he's at his best."