Further to my comment above: I'm really hoping the Sens can sign Michael Stone to be the 3rd pair RD. Upgrading on Wideman will allow the Sens to scale back Ceci's minutes and also allow Karlsson to ease up a bit, especially as he recovers from injury. Stone would also replace some of Methot's PK minutes and would be a steady partner for a rookie LD like Chabot.
Claesson - Karlsson
Phaneuf - Ceci
Chabot - Stone
*Harpur
With Karlsson probably missing all of training camp and the beginning of the season, there will be a steep learning curve once he is back to see who fits where. Until he does return I'd suspect Phaneuf plays the RD side (?) on the 2nd pairing and Ceci steps up. Stone would be an interesting edition, but Jaros plays the RD side as does Wideman if Dorion does not add, so Wideman probably keeps his slot if Dorion does not.
RD side of Ceci, Phaneuf, Wideman could be starting the season. That is pretty tough. Take until end of November to figure things out once he's back I'd guess...
LD side will be stressed as a result as well. Claesson, Harpur, Chabot, Englund will have a chance to show what they can do. Borowiecki likely sticks as the 3rd RD guy.