Overeem would be a better choice than Werdum.
Werdum is good and looked impressive in his win over Antonio Silva.... but to fight Fedor in a competetive match???
I do not think so.
I don't even believe that Werdum could beat Brett Rodgers.
Overeem is the champ, and is more of a legit-threat to Fedor.
In the end, it really does not matter....
Fedor is the MAN!!!