Karlsson is an easy choice but really Meier shoulda been (but has fell mightily this year), where Hertl has aswell but the entire team has and hertl has dealt with injury issues
Don't use chel terms the only franchise players on this team are Crosby, Mcdavid, Kane and Ovi
I think you could make an argument for Pastrnak. Since entering the league his G/GP is equal to Kane's and t-4th in the entire NHL and nearly a P/GP player.