GGG has never fought at 168. He is a career middleweight. Even taking him out of his comfort zone, he still has an iron chin and heavy hands. In his prime he was widely avoided. Loses to Ward. GGG has an iron chin, not iron testicles. Ward would have nut punched and foul/held his way to a “win” as demonstrated against Kovalev. I believe he beats the rest in his prime even at 168 but if anyone else could win, Froch would be the one to pull it off.
Groves has success early but gets broken down, bit like the Kell Brook fight. DeGale will have his moments but always loses focus in the middle rounds and Golovkin takes over and DeGale just doesn't have the stamina and gets stopped in the last third of the fight. Jack would be the easiest fight for GGG. He's a good fighter but doesn't have any real weapons or clear advantages to beat GGG. Froch, I might give the slight edge. Even if GGG's power translates up to super middle he's facing a guy he can't keep down even if he can drop him. Froch too big, too durable, too damn stubborn and while Golovkin will no doubt put Froch through hell, Froch I think comes out on top after a war for 12 rounds. Ward wins a clear decision, simply too good, will out box Golovkin.
GGG could definitely outbox and outjab Froch. Froch wasn’t on GGG’s technical level he’s great in a dog fight though but so is GGG. GGG UD.
I would say he beats all, except Ward where he would still have a fair chance. I would favor Ward slightly though
Jack, Groves and Degale become just another victim(s). Andre would nut-punch, elbow, headbutt, and foul his way to victory while Max Kellerman masterbates to his 'technique'. (Okay, okay; he'd be able to use boxing technique to do it, too.) I don't pick any SMW over Froch until they've proven they can beat him.
Beats groves and degale. Jack does enough to lose big fights I favor froch but its winnable Ward wins handily
He beats Jack, Groves and Degale. Loses to Ward and Froch. A fight with Froch would've been some spectacle. Iron vs Iron.