Thanks for the explanations. For Holyfield, I thought that your light-HW was a merge between it and cruiseweight (when yes, he is the greatest ever). About Foreman, probably talented wasn't the right word from me (if you look at fundamentals, Ali is easily the most talented HW), but he had such a big punch that essentially destroyed everything and his fights against Fraizer and Norton alone should be enough to put him in top 5 IMO. I think that had he beaten Ali, he would have been mentioned as the best HW ever. Personally I have him at #3, below Ali and Louis, but above Liston, Fraizer and others.1. I can see some of your point about Foreman though I don't share the talent view. He wasn't overly skilled IMO. I don't know that he was an Ali away from being the best. Jimmy Young boxed his ears off in what was basically his prime. I think Holmes was more talented but it makes sense you'd have Foreman top 5 since he blasted Frazier & Norton not to mention was successful in his comeback.
2. Holyfield never fought as a Light-Heavyweight. He was a Cruiserweight and IMO almost the perfect fighter there and undisputed #1. He'd probably be my #6 at Heavyweight too fwiw.
3. I can see a point for Robinson being #1 for sure. He's arguably (based on my p4p he is) the best fighter that's ever fought there. He did win and lose his title a lot though the competition was high and his middleweight days were past his welterweight best. Monzon was a career middleweight who in 100 fights only failed to beat one foe (a South American draw), reigned for a long and dominant period against mostly quality.
4. I think Leonard is better overall in a p4p sense but had a very limited amount of time at the championship level at that weight. Gavilan was in the golden era and had a ton of depth to his resume though and top hall of fame fighters. Leonard's wins over Benitez and Hearns are extremely great though. I can see your point.
5. Duran gets such a high p4p ranking due in large parts to his dominant lightweight reign but also his unbelievable achievements above lightweight. Beating a prime Leonard at 147, ravaging the 154 title from Moore, incredibly beating Barkley at Middleweight 17 years after the Buchanan win started the lightweight reign.
6. An oversight on my part. I'd have him in my 147 top 5 and I think he's anywhere from 4-6/7 at 126 & 135. His lofty p4p ranking is also based on the simultaneously holding all three titles whilst setting the record number of defenses at 147 in addition to probably having the best back-to-back years in boxing history from 1937-1938.
7. Langford is definitely a "pound for pound" fighter. A lightweight that was a victim of his time but whipped quality all the way from lightweight to heavyweight and often. Very often.
The last points. Ali I can see in the top 10 and don't really complain to see top 5. If we want to split hairs I do think he lost 3x to Norton and was less complete a fighter as the other fighters in my top 10 though he had some incredible attributes others can only dream of having. There's Langford and Leonard film. Leonard especially was ahead of his time. In that case it's a lot of going off what their resumes look like in addition to what was written about them in their day and a half century later when historians had a chance to put them into perspective. Unfortunately there's no fight footage of Greb but on paper his resume is arguably the best ever. I understand your point though which is why I didn't really account for head-to-head mythical matches. Lennox Lewis would be in my top 3 at Heavyweight if it was.
Greb for me is the only fighter I've never seen whom I would put in these lists with confidence. His story and career is beyond ridiculous.
Pac and May, not worthy of top 5 in their classes (which essentially means that no fighter of the last 20 years, or 1/6 of the history of 'more modern' boxing is worthy of being considered an all time great)? Sorry, but I just not buy it. It is just an 'everything was better before' syndrome.