I agree. Except that I see Poehling as a viable option for the fourth line. We are deep on wings, so he'll be able to play with relatively skilled linemates and he's the kind of player who can climb himself up from the #4 center spot, as Danault did.
If Domi stays at C, Montreal isn't all that deep on the wing, actually. Not deep enough to supply quality wingers for Poehling, not if suzuki plays in the AHL, as he perhaps should.
LW is much deeper than RW, but it is not that deep. IMO, Armia is a 4th line RW, not a 3rd line RW. Beyond Gallagher, there is no real quality top-6 right winger; not Shaw, not Byron, not Armia, not Weal.
Montreal needs at least two more scoring wingers to have a strong top-9 and have a solid 4th line because other players like Byron and Shaw have been bumped down as a result.
IMO, here's the short term depth chart for the Habs with players needed to fill the holes identified by Xs:
Drouin - Domi - XXX
Tatar - Danault - Gallagher
Lehkonen - Kotkaniemi - XXX (eventually, Suzuki, IMO)
Byron - Poehling - Shaw (eventually, Ylonen will replace Byron)
Weal, Armia
Even then, IMO, we need a better 3rd line LW to have real depth in two or three years:
Drouin - Domi - Sizeable, scoring RW?
Anders Lee (Sizeable scoring LW) - Kotkaniemi - Suzuki
Tatar - Danault - Gallagher
Lehkonen - Poehling - Ylonen
Weal, Armia
Ideally, management manages to land a scoring winger like Anders Lee this offseason for zero assets lost and adds a LHD via the trade route, on top of drafting more of those. Who is traceable for a LHD? Byron, Shaw,Lehkonen, plus Ikonen and one of our 2nd round picks and 5th round picks.