Don't think you need to flip anyone, the Hoffman/Zibanejad/Ryan line has become the line teams focus on. It's happened naturally and I don't think you break that up. It's been proven in the past that Stone/Turris/MacArthur works and with easier matchups they should start producing more again.
All in all I think Ottawa needs 1 more top 6 guy that can move around the lineup like ROR. To me that's just a player that makes too much sense for Ottawa not to go all in on in terms of what they have available to give up.
Goaltending is set.
Defense with Methot is set. Lack experience but it's coming as well as the confidence as a group.
Forwards, needs some fine tuning. ROR is a perfect fit both on the ice and in the cap world seeing they can get Greening, Smith, Phillips, and maybe Neil off the books. You look at what Tampa did with their vets and who they have added (Callahan) and that's what I think Ottawa should be doing with ROR.