He cuts the ring of like nobody, has an iron chin, devastating punching power and he can box well. No, no one from 154-168 can beat him!
Froch and Ward both have very good chances of beating GGG. Froch more so than Ward, IMO. I think a lot of people get the style match up backwards regarding those two.
I think Ward beats him in a really ugly fight. Wards style is so horrible but very effective. Left hook , straight right , head butt , hold and repeat.
I think Froch would take him places he's never been before, grind him down and TKO him. Ward would simply embarrass him.
Last person at 168lbs who would beat him imo would have been Joe Calzaghe. GGG can cut off the ring. He's not doing that against Joe. Ward might get knocked out if he faced him. Froch will walk into something bad. Degale and Groves both lack stamina.