GGG doesn't even need to go up in weight, he can just come in at his normal ring weight 170lb or whatever and face a 200lb+ HW. It won't be for a title of course, but it can happen. Which Heavyweights out there do you think the Triple God can beat? I'd back GGG to beat someone like Burrito Boy Arreola.
Roy Jones and James Toney went to heavy, so I guess not altogether out of this world thought. The current heavies are tough as nails tho
Golovkins style may be better suited for hunting down weaker prey. Jones and Toney were more elusive.
GGG would get KTFO by any lower tier HW. GGG walks his opponents down, how the hell is he going to walk down a guy who outweighs him by 30-50 pounds?? atsch Now Kell Brook, that's a different story. He would have a solid chance against any top 3 HW in any era. Brook is a BIG WW, and walks around at 210 lbs ripped.
Tough as nails? Which ones? ggg doesn't have the frame to carry the weight ... It would take a few years and a few Roid cycles as well.