No, I don't think anyone Giroux is truly better than Couturier. And obviously Couturier is the future. But this season, there's a pretty reasonable argument that Giroux has added more value to the Flyers than Couturier has. By that same "Wins Above Replacement" statistic that Giroux is 8th in the league in, Couturier is 69th this year.
O'Connor thinks Couturier has been battling injuries all year, even though Coots says he's recovered. I wouldn't be surprised. He definitely hasn't played to his full strength this season.
And to clarify since you've called me out on this before, I think Couturier is the best player on the Flyers. I don't think he has played like it this year.
Same thing as Hart. He is the best goalie the Flyers have. He has not played like it.