What would Bivol have to do to surpass Usyk

WAY too much! Not possible IMO

 

no.

 

He'd have to finish cleaning up at Light Heavyweight then move up to Cruiser and become unified there against Ramirez and Opetaia.

But he'd also have to do it and make it look easy. If he struggled and just got the wins then that wouldn't help the comparison.

He might get bonus points for sneaking up and grabbing a vacant heavyweight title or of a weak champ in his later years as well.

Also, probably one of the biggest things when it comes to these sort of things, he couldn't lose again.

 

Not achievable. His best win has an asterisk next to it and CW is such a wasteland now that he would be like a 10/1 favorite against anyone not named Opetaia now. Even if he beats Beterbiev decisively in a 3rd fight losing the first fight and struggling in the rematch against a 40+ Beterbiev are going to hurt him big time even if he went on to achieve everything OP is asking for. Usyk is just in a different league accomplishment wise compared to everyone in his era.

 

Nobody in this generation will ever come close to surpassing Usyk.
His haters are going to have to cope for a very long time