Yes a lot of truth to this. People will say that Groves, and the ending of the first fight had huge effect. That is of course true. But fighters talk smack , and boxing has dodgy endings to a match all the time. Without the platform and promotion of a real promoter its just trash talk and another day of "well dats baxxing..."
I think the way Froch reacted to after that fight hyped the next one. He was saying there was no need for a rematch. That Groves was getting KO anyway. Etc. So people started asking for it, talking more about it, how Groves was robbed by the ref. It was an injustice. If Froch would have accepted right away in that ring, be a gentleman, the hype would'nt have been that high.