Idk. UC got DQed for wrong weight class vs Us so I'd think the same thing would happen and TC would have to bite a 2pt bullet. That fighter would also probably go into the dead fighter pool as a result.
If a precedent(sp) had not already been set in the other match up then i would just let him switch, but if it has been done once it has to stay the same. Will def fight catch weight for the hell of it though spidey.