Hagler and Hopkins struggled with lesser smaller weaker opponents than GGG, and people are stupid to think SRR is unbeatable at 160, he wasn't. Loads of fighters from over the years beat SRR at middle. Monzon too has a very tough time with Golovkin..Hes a 160 great, but he aint knocking out heavies
I don't doubt that Golovkin has the punching power to put nearly anyone's lights out. Smaller fighters used to fight and beat bigger heavyweights all the time, although there was usually a large differential in speed and/or skills to facilitate that. Wilder fought his last fight as a rehydrated cruiserweight and was still able to drop walking tank Luis Ortiz with only one or two shots. I doubt Golovkin has the power to do that, but he could certainly knock out some of the smaller heavies or cruisers with speed, and punching precision alone. Whether he'd do so would be another thing entirely, since a whole load of other variables then enter the mix.
Going strictly by POWER, he could. The human body is basically a glass canon. He wouldn't be able to in practical terms though. But as far as force generated and how often the strikes would come he could. It is just that he would never have that opportunity because he would either be stopped before then or be completely unable to get in.
What makes you think GGG would not be able to knock out guys like Szpilka, Martin or Breazale? People tend to forget that GGG is as tall as MIKE TYSON, but has a longer reach than him.
One jab from Price or any heavyweight with decent power would decapitate GGG. Sure some smaller fighters have great power but they’ll have a much worse punch resistance than a heavyweight.
Hagler struggled and lost to lesser fighters and Hopkins did. Could you see Vito Antufermo drawing with GGG?? No me neither. Do you see Taylor outpointing GGG? Nope, me neither, GGG stops him....See!!!!
If you offered a free shot on a heavyweight to most middleweight's with a decent dig, I'm sure they'd have a chance of knocking them out, not just GGG. But in a real fight? Only if they were allowed step ladders and a hammer.