They both should be. I would rotate all the guys. They both have spurts. I think Harkins needs more time to adjust so I would swap him first then swap out doc.
Put zorhona as 4th line center
Doc - eller - accari
Harkins - eller -accari
The problem is you have to waive someone to change things up. I personally don't care. Out of the 4th line I notice Neito the most and Acciari hasn't really done anything to warrant moving to the 3rd.
Then you have Eller as the noticeable one on the 3rd.
As far as Carter goes, he's still playing with plugs which neuters all offense entirely. There's really no point in dressing him in a complete defensive role.
Their identity is complete neutralization of offense in the bottom six.
If they can go 25-12-4 in the first half I'd consider that a win with current status quo. But I feel that might be a reach if they are riding the top six that hard for the age it is. It could just as easily go 20-17-4.
So waive who you need to, but give the bottom six some life that they can play their 3rd line wings more than 10:22/27 and actually create some kind of spark. That's 4th line fodder minutes wise. The top six is gonna get run into the ground.