To me it isn’t about earning playing time. Barby has been solid this year and I would like to have at least one intact line against the Kings. I like rewarding Kostin so I think it would be good to move him up, which is why I might put him with ROR.
I'd considered Kostin with ROR and Perry too...but with both Saad and Buch out, you're likely bringing in both Clifford and Neal. Neal and Perron had success 4 years ago, while Clifford is strictly a fourth liner. There are a few ways to play it; we'll probably know the time of tomorrow's morning skate, if not today's practice.