The only thing that the Fedor vs Werdum fight demonstrated is that anyone in the guard of a BJJ master can be submitted. Hell, even Rickson Gracie(7th degree black belt in BJJ) has been caught by other BJJ masters and submitted.
But here is the thing: no one besides a BJJ master can beat Fedor. And the BJJ master will only win if Fedor makes the stupid mistake of getting into his guard.
People who think that Overeem will beat Fedor if they fight are delusional and crazy: Fedor will pick him apart, find out his weaknesses and demolish the "Demolition Man".
The only Strikeforce heavyweight that will pose a real challenge to Fedor will be Josh Barnett. He has a black belt in BJJ and is bigger and stronger than Fedor and has the World-class wrestling that the other Strikeforce heavyweigts lack. I don't see Werdum, Overeem or any other Strikeforce heavyweight winning against Fedor because all of them have serious holes in their games that Fedor can exploit successfully.
SUCKMYMUSCLE