For JDS??? I say the most credible guy out there at the moment is... Josh Barnett
IF THE UFC SIGNS HIM AGAIN!
There really isn't that many good fights out there for him right now which is sad.
I see them putting Struve against him which would derail Struve as any sort of challenger or Cormier if he decides not to make the cut after fighting mir.
Werdum is a good fight but I'm sure they will want to keep him in the win column for now towards a title shot after Reem (if everything goes to plan) 
He should just fight Cormier. Seeing as how everyone is sold on him already and writing Mir down as a win already. Just save the trouble and set it up 