As awesome as Gaudreau is, and how cool it would be for him to come home, this is a trade the Flyers cannot afford to make. Couturier is currently their top line center and he was a monster in the playoffs - literally playing through serious injury in attempts to carry the team on his back. The Flyers, and the fans alike, honor and reward those type of efforts. And, rightfully so. Couturier will not be traded.
That aside, the Flyers have two upcoming picks and should be able to choose from a couple of nice wingers at 14 and 19. I could see the Flyers targeting Farabee, Kravtsov, Denisenko, Noel, Bokk and Kaut with those picks.
The value of a Gaudreau for Couturier deal looks decent on the surface, but it's not a smart deal for the Flyers and one Hextall would never make.