Jermall has Trout and Korobov problems. Golovkin KO's him in 2012, 2016 and 2020. Neither Jermall not Jermell are on Golovkins level.
That ggg was in his phisical prime, he rises to the occasion like all great fighters and stops charlo inside 8 rounds. It is not so much the competition faced but more so the fighters ceiling and ability, great fighters can be fighting bums 1 minute, jump in with the top guys and woop em the next. Some fighters are just that good. Charlo is good, ggg is great.