I think SJB had more chemistry with MB as Claudia than Carly despite it being the same actress. If SJB ever came back as Carly I'd want her with Jason.
I think the more interesting period of Sonny & Carly under JFP was 01-05. The panic room, Brenda's return, Kristina's paternity, Sonny's affair with Sam, AJ kidnapping the kids, Faith Roscoe. Faith now seems like a precursor to Ava.