Froch retired So he didn't have to face GGG. And as for being able to move up, he used to openly admit that he walked the streets only 2 or 3lbs over the SMW Limit. He was always in shape , I'll give him that.
But I don't think Froch had as much power as people think. Yes, that was a great shot that ko'd Groves , but look at his fights before Groves and they mostly went the distance.
Infact, when he stopped Bute, he threw about 30 unanswered punches and Bute still never went down!
I just think GGG would walk through his punches and keep walking Froch down.