Who says they'd have to play together?
Go with Lizotte-Rust as one PK duo and Glass-Marner as a PK duo. This team runs with 3 PKing duos.
I'm skeptical of it... Sullivan has a type, and Marner is the light, non physical, scoring type, he won't put him on the PK. He has to galaxy brain everything, but then does nothing.
I agree with you, I think those PK units would be pretty effective. I would love to see that lineup you posted earlier too... But we have Sullivan mucking everything up. He won't line match, he won't utilize players to their best lines and pairings, his PKers are immobile puck posts, his powerplay is insane.
If this team set the lines like you have them, yup, I agree.... The goaltending needs to be upgraded, it's an abomination.
But you can give Sullivan team USA and he will still make bad lineup choices and have hurt players in the lineup taking spots away from players who can contribute, while deploying a system that will fail.
So, yes, your theoretical lineup is great (except for goaltending) , but the reality is Sullivan will shit it out.