Rebecca will more than likely be at one or two therapy sessions because honestly, after everything that's happened it might be nice to get on even footing with her own emotions. A few concepts she'd subscribe to: Turning a new Leaf, Poly-amorous Individuals, PTSD and the lovely Murderers Anonymous club.
Karev will be a pissbaby but he'll drop by AA, even if he's not the alcoholic he's afraid he'll become.
James/Logan is still ignoring his past as Logan (which is hell to type out since he's considering himself James atm) but you know he's got more than enough reason to attend Murderers Anon, Addicts Anon, Terminal Diseases Anon, etc. Just uh, try to get him there. Honestly.
Peter and Jezebel have no set plans, they may pop around. If you've got any ideas for 'em too, let me know.