Think the Habs gave up too much for Dvorak but they were in a tough position.

I don't think Gallagher and Toffoli play on the 3rd line, they are too good for that.

so as hoffman, drouin, caufield and anderson are also. habs have 6 good winger it's the center line that should have been better a littlebit. But its okay, im okay with dvorak instead of kk, sure I would have love Danault, but he choose the sunshine for 3M more lol.

MB put them in that tough position 110%.
Self inflicted...karma's a b***h

Drouin should be with one of CC, TT, or MH.
Suzuki should be with Caufield.
Gallagher should be with our weakest center (he does his thing regardless of linemates).

Drouin? - Suzuki - Caufield
Not Drouin - Poehling - Gallagher
Drouin? - Dvorak - Hoffman/Toffoli/Anderson

If Anderson stays RW, the only place for Drouin is with Suzuki. That leaves Toffoli with either Gallagher or Dvorak.
Some different combinations will have to be tried before anything is determined, but Toffoli with Gallagher makes the most sense to look at first, as it's the least questionable setup.

You can't consider that the 3rd line though. Playing time won't differ significantly between the 2nd and 3rd lines in that scenario. Dvorak and/or Evans will also likely take some of Poehling's shifts (at least at first), while Toffoli and Gallagher will also get PP time.