He and Pacioretty seem to work well together, which is good because I find Danault to be completely void of chemistry with anyone else.
Lines I'd go with:
Galchenyuk - Drouin - Gallagher
Pacioretty - Danault - Shaw
Byron - Plekanec - Lehkonen
Hudon - McCarron - Mitchell
I know, call me crazy for putting a 4th liner on the top line, but it just seems like that kid can put the puck in the net when given the opportunity, I dunno.