they really should set it up - its perfect because werdum is the interim champ. if jones comes up in weight - he could retain his belt and use weight as an excuse. if he beats werdum, he will get a shot at cain if he wants it. if he doesn't, the interim belt goes away.
i think this is a huge money fight - the guy that beat fedor fighting jones.
ps. i could see werdum gladly going to the ground as well.