Seth Jones is clear cut a #1D, despite what the analytic community may think. Dumo proved he can be a #2D in back to back cup wins, so id be confident with him slotted there if healthy. Chychrun also looks to be a solid #3D, if miller can rebound on a better team like this, he absolutely could be a #4 like he was in Vegas. The bottom pairing is fine.
I dont think this D is bad at all. Sure its not the best in the league, but it could absolutely win a cup. this team would be a favourite