A rematch will just make things worse for Bret. He did really well in the fight. Instead of whining, he must get back to training and improve his skills. Get more fighting experience one step at a time. Rushing things will spell disaster, patience, you'll get your chance again.
Nog fought Fedor 3 times and Coleman twice he should re-evaluate what he's getting himself into. An immediate rematch now that Fedor had him measured will just be an easier finish. The most damaging things Bret did during the fight was to cut Fedor (scar tissue) and GNP Fedor where he almost got armbared.