No, it makes total sense for the Flyers to get as much value possible for him right now.
You have Provorov, Samheim, Morin (who requires waivers) on the left side and Niskanen, Braun and Myers (who requires waivers) on the right side with Hagg and Schlemko as #7/#8. At best, Ghost will be playing third pairing minutes, bringing down his ice time, points total and overall value considerably. At worst, he’ll be taking up a roster spot from Morin who deserves a chance (meaning he either is waived and lost or sit on the press box for whatever how long). His value is certainly not going up if he stays a Flyers next year. Now would be the right time to sell.
Philadelphia are not in a position of strength to deal Gostisbehere. Teams knows that he is the odd man out, especially after a down year. I personally believe (I might be wrong) that it’s Fletcher who leaked the « We would love to keep him but we are listening to offers as well » Thinking it might put some pressure on whoever inquired about Ghost to up their bid.
Montreal is in a position where they can be patient and find the right deal. If Bergevin refused to include Poehling in a deal for ROR, I doubt he would be all over the Domi/Gallagher for Ghost idea. He’s clearly waiting for the right opportunity.