I reckon Douglas could outbox and outwork Ali, this is the fight where a young hungry contender with the right skillset and size would pull off the upset. Ali beats him in the lackluster rematch a few months later.
The one who knocked out George Foreman, but if he were fighting Kingston Foreman or Caracas Foreman the night he beat Kishasa Foreman who knows what would happen!
Kinshasa Foreman was exactly the same man as the Caracas and Kingston ones. Ali was simply a far harder puzzle that Frazier and Foreman.
I don't think weight class comes into at all they are both heavyweights although Douglas would be giving a lot of height , reach and weight away to Godzilla
No way is Godzilla a don king fighter at the point where Godzilla is in his prime he is definitely a japanese controlled fighter .
If Godzilla has to come in under twenty tons he'll be emaciated, unfair to Godzilla to put a weight restriction imho.