The Carrier acquisition has been the biggest boost tbh as it has solidified the defensive pairings.
It has enabled Guhle to play on his natural side at LD, and they both form the Habs shutdown line, being deployed almost exclusively in defensive situation allowing MSL to use the Hutson-Matheson pair in more advantageous situations, especially offensively.
Laine coming back and having a massive impact on the PP with his goalscoring has also been great, but he's been injured for the past few games and the team still kept winning.