Would be 10 x the FMW/Paq fight (obviously not financially but in boxing entertainment value) I've always wanted to see this fight, and personally think Froch will get a big margin on the decision.
He only got knocked down by Groves, because he massively underestimated and disrespected him. Once he was up, completely different fight and pummled him to get the stoppage.
The next Groves fight, froch knew exactly what he was getting and smashed him to pieces, it was brutal.
GGG is a beast, and probably the hardest shot pound for pound, but as it's been said he hasn't fought any world class champions with a chin/stamina/boxing ability like Froch.