Usyk gets a time machine, does he clear the top level of every era and go undefeated

It’s definitely possible that he’s the h2h goat, but are you really asking if he can keep his 0 by fighting that entire list in one career span? That, I do not believe is possible.

 

He would have great fights against Ali, Frazier, Lewis, Tyson, and Evan Fields (because testing was in its infancy), winning more than losing.

 

2000s

Wladimir beats Usyk he excelled vs Southpaws.

Vitali loses to Usyk based on the struggle he had vs Byrd.

Usyk beats Povetkin/Byrd on points.

90s

Lewis wins his uppercuts would be the key.

Holyfield and Usyk at their best is 50/50.

Usyk beats the Tyson who come out of prison.

Usyk out points Bowe who had issues when boxers fought him at range.

80s

A prime Tyson stops Usyk the worst stylistic match up for Usyk.

Holmes/Usyk is a close call hard to pick.

Usyk outpoints Spinks, Witherspoon, Cooney.

70s

Depends what version of Ali in the 70s I think the Ali who outpointed Norton in their 2nd fight who looked reminiscent of his peak in the 1960s with the constant movement may outpoint Usyk. But it would have to be a very specific version of Ali in the 70s.

Usyk outpoints Foreman who had issues vs boxers.

FOTC Frazier outpoints Usyk an ATG swarmer is the worst kind of style for Usyk.

Norton thrived against boxer types and I think he would run Usyk close although Usyk probably edges it in a hard fought decision.

60s

I'm more confident of a peak Ali with his handspeed/movement being able to outpoint Usyk.

Frazier beats Usyk again as I already said above.

Usyk beats the rest in the 60s Liston, Williams, Machen.

 

Best versions, no injuries, H2H...

I think he loses to Wlad, Lennox, Ali and Foreman,

50 / 50 Tyson, Holmes, Frazier, Vitali

Usyk beats the rest of them

 

I don’t care if his name is Muhammad “I’m hard” Bruce Lee. Nobody is beating Usyk.

 

somebody would catch him. too much to ask. just 2 cents.

 

Ok, so let's pretend everyone he faces in their prime. He doesn't bear all those guys. Nobody beats everyone you mentioned. They are ATG's or at minimum, ruled an era or gave hell to the greats for a reason.

 

As other have said, no beats everyone 100% of the time.
Never a horse that couldn't be rode, never a cowboy that couldn't be throwed.