I'm excited to see what this team will look like when fully healthy. Ducharme probably has two duos for the top 6 and two lines for the top six when the team is healthy:
Tatar-Danault-Gallagher
Toffoli-Suzuki-Armia
Those lines/duos have very strong results over not insignificant sample sizes. I don't know if Drouin will play in the playoffs, but if not, I'd like to see the a more sheltered 3rd line of:
Caufield-Kotkaniemi-Anderson
I like Kotkaniemi at center, I like what Caufield has done and I think its worth seeing the two together. Anderson fits with almost any line and his straight line speed and scoring touch should be a better fit for KK and help create space for Caufield. The 4th line should start with:
Lehkonen-Evans-Perry
With Byron, Staal, Frolik, etc. getting shots based on play or competition.
The D seems a little less clear cut, but I'd look at:
Edmundson-Petry
Merrill/Kulak-Weber
Romanov-Chiarot
The first pair has generally been very effective. Weber has been playing hurt and Romanov isn't ready for top competition, but spreading time better makes sense to me to help address both of those things. Chiarot has looked a lot better playing next to a D-man like Romanov compared to Weber, so I'd like to keep that pair together. Merrill or Kulak make sense next to Weber as both can skate relatively well.