The only reason GGG won was because of his weight advantage! If weight wasn't an issue, for example if Kell was a natural middleweight, Kell would beat GGG 9 times out of 10! More skilful, just as great a jab, more slick, better defence.
Better technique. Higher ring IQ. But clearly not the better fighter. Power and punch resistance are just as important to being a great fighter. If they didn't matter Jorge Linares would be p4p #1.
Wait. Kell weighed MORE than Golovkin on the night so how was he exactly bigger? Golovkin didn't feel anything Kell threw thats why he threw any boxing out of the window and went straight for the knockout, he had no respect for kell.
Kell did great. But the word 'if' is the biggest word that's ever existed. You can apply it to anything.