Hahahaha!! Can you imagine Kovalev trying to go against the grain with Vitali? He'd be training like a ****ing machine with Iron Fist on his back.
Anomalies exist. Look, best of luck to Sergey in the tail end of his career, but usually when you quit its because youre heart is not in it anymore.
He was punched with 3 full blooded blows to his tackle. He hardly quit that being said after being rorted twice and with America's PC culture the system may not let him rise to the top again. And believe me I hate sounding like Farmbot but his Adonis T-shirt stunt has bit him on the bum.