The way i see it is Radulov will start with Plekanec and Lehkonen on the second line. But rapidly will switch with Gallagher as nobody has ever set good chemistry with Plekanec, except Gallagher.
I know fans love gallagher playing with Chucky but Radulov with Chucky and Pacioretty would be deadly.
Second line of Lehkonen-Plekanec-Gallagher would be a great two-way trio as Lehkonen and Plekanec are really good defensively.
Third line of Carr-DD-Shaw could also be a pretty good offensive complement to the first 2 lines.
The only thing i would like to see from Bergevin, is getting a little bit more offense coming from the back end. Replace Emelin by Fowler, somehow, and you get the best eastern conference team.