Drouin is only capable, when he has time and space, and yet even on the PP he is not a very good player these days...
As for the language issue with DD, the posters did not turn it into that, the putz MT did.
That's exactly the problem. The habs have a lot of players that can take advantage if someone opens space for them and fail totally if no one does. The habs really needed Kotkaniemi in a way the 'Canes just don't, at least unless he develops a lot. Carolina doesn't need a player to open space, they have lots of guys who can do that, while the habs really, really need someone who can do that and it isn't Dvorak, yet another player who could look good if someone else were driving play for him.
The habs really need to deal two of Drouin/Caufield/Hoffman/Toffoli, not because they are bad but because they need the same minutes, and draft guys who drive the play. Getting play drivers is hard, both because the habs can't seem to identify them and because teams that can tend to consider them core players and keep them around.
The Canadiens could probably shoot themselves in the foot long term by identifying and obtaining undervalued play drivers who don't necessarily put up big stats. It's unlikely that they could become competitive without a top center and top D, but they could probably get to the point of scraping for the playoffs just by going from a totally unbalanced team that was put together randomly by an arrogant amateur to a planned, balanced team lacking high end talent.