Ruhwedel would be a solid enough partner in a sheltered role, it’s not like putting him with JJ and crossing your fingers. What it sounds like you want is to avoid CC messing with Marino but I’d be leery of messing up POJ out of desperation, then you’re back at CC with the top D prospect being rattled. A good partner doesn’t mean a young player in their first game won’t be overwhelmed with too big a role.
It’s a bad situation (that’s on JR for signing CC) to pick your poison with but I’d say being cautious with POJ is the right choice in the shorter and longer term.
Let's say that we consider that Dumoulin and Letang will get the toughest match ups.
Let's consider that Matheson comes back quickly.
My strategy would be to go:
Dumoulin - Letang
POJ - Marino
Matheson - Ruhwedel
I do not see that as "POJ playing in the top 4". I see it as maximizing our assets.
POJ plays 5v5 with Marino, but is essentially our 6th D. Matheson will get PP2, Ruhwedel will get PK2. POJ might get some PP and some PK if needed, but mostly, he'd get 15 5v5 minutes.
Ruh and Matheson are a good fit. Ruh does not take risks and can handle the puck if needed. He is steady.
Marino and POJ should be a good fit as well.
I do not think my idea requires POJ to play a bigger role than he would with Ruh.