Would you consider Lennox Lewis and Evander Holyfield fitter and more athletic than 70s/80s fighters

I'll bet you know more things than me from observation due to so much boxing gym time, but is it really accurate to say any "super fit" guy is out of gas after anything like a single minute?!

Unless they are literally not breathing at all, would it not be more accurate to say that while this nervoud tension causes them to use up their aerobic capacity much earlier than they need to...
Is it not overwhelmingly likely that while they were really cut &/or heavily muscled, their cardio conditioning cannot have been great if they get tired so immediately?

I mean even young Foreman took some rounds to get exhausted (sometimes), was he super duper most fit ever but just tense compared to tjose guys?
More likely there was a huge disparity between muscles, strength, & cardiac fitness no?

 

Holyfield needed both intensive, Lee Haney training and PEDs to be even as strong as these guys.
I would not have guessed that any of those guys were so fast at a sprint.

 

Courtney Shand was Lennox Lewis's strength and conditioning coach and Lee Haney was Evander Holyfield's. Maybe they were more athletic? Lewis's background was in basketball I think? and Holyfield's was American Football. Both probably stronger comparatively to the 1970s and 80s boxers and possibly more co-ordinated and explosive from all the plyometric training. However when I look at Ken Norton a marine with a American Football background and who had conditioned and prepared himself for 15 round fights he was just as athletic as either of those guys.

1980s Mike Tyson pre prison worked exclusively with calisthenics and no weights for his strength training. A young early 1980's Frank Bruno immersed himself into circuit training and weight training.

I'd say overall Lewis and Holyfield probably had a better understanding of nutrition and recovery and their background in other sports which possibly made them more athletic than the 70s and 80s competitors but another example is Joe Bugner who was a discus thrower before he started boxing. So I might conclude that they possibly had more access to coaches , conditioners , nutritionists etc especially both of them being on their respective Olympic boxing programs but not they weren't necessarily more athletic than their predecessors.