There will forevermore be asterisks by Kovalev's defeats; first one, millions of people disagree with second one could very well be from fouls i.e. low blows.
ATG is a tall order, he'd have to unify 175 with 1 or 2 champs and win a belt at 200 for that. Kov needs a few more meaningful fights at 175 and he'll be in the hall of fame.
I don't think Yarde will still be able to make 175 by the time Frank throws him in with those animals
He is the best at light heavy and I think he beats all the champs and when he does get all his titles back that he got robbed off him I don't even think he needs to move up in weight and to alot of people that cheat is a all time great and imo kovalev beat him so don't see any reason why he can't be