How do you come to this conclusion? That he was so affected by his brothers loss, he couldn't mustre enough to put away a guy who took the fight on a couple weeks notice?
Going into the Jermallo fight Korobov hadn't fought anyone with a pulse in four years He hadn't registered an inside the distance win in five years He had only fought once in 25 months and four times in four years, three of which in 2016 ie. over two years before he fought Jermallo Against 16-12 tomato can Jonathan Batista who was 2-11 in his last 13 fights and had been stopped x 9 in those 11 losses. Korobov couldn't get him out of there. Korobov was training to face another tomato can in an 8 rounder at 162 on the undercard who was 1-4 in their last 5 fights Korobov got hurt in round 12 because he has terrible stamina and fades in the second half of fights and the fact that he was training to face a tomato can in an 8 rounder on the undercard can't have helped in that regard.