Of course being heavier is a huge factor. That's a big DUH! LOL. There are many factors that play a part. Let's just agree to disagree on this one.
Of could not be known from your post, especially when you responded to me, that you understood that weight was a huge factor. Also you write let's disagree kindly-I am all for that, but since even when I write in such detail you are so taciturn I do not even know what you differ with, I can only guess. If you intend to say that other factors can be larger-even though weight is huge-that is very implausible. I have outlined the effect of weight, & there is no indication that the other elements could mean so much. If you mean that longer arms are a big demerit, I said that while you do not have arms double the length/ROM for normal size individuals, I keep an open mind that like for pushing motions, maybe it is more of a handicap than provides leverage. You weighed in not at all on the issues of muscle insertion areas + being broad harming ability. Because the discrepancy between the massive strength of some huge individuals & how many pull-ips you would predict even at their much larger weight-& things like that mass monster not even able to mount a horse... I think other factors like this are significant, at least when we are dealing with b8gger men.
I am not going into more detail because honestly, I don't know much more than what I already said and I am not going to pretend I know more than what i already do. I am just telling you my experience in the military. Most guys who excelled at pull ups were shorter, lighter which also in turn means shorter arms. Does that mean no taller, longer armed guys couldn't bust out 20? Of course not. But I think they were at a physiological disadvantage and would have to be in incredible shape to get to 20. This one guy in my unit who did 30 was about 5'5" and 140 lbs. I would bet that most of the people who set world records for pull ups are on the lighter side. I would be shocked if any of them are like 175 lbs or more. Maybe I am wrong.
I doubt that guys were 175 or so breaking world records. The outliers who master this have incredible endurance & efficiency. The record for 1 minute is 63, & approaching 8000(!) in 2 hours. Their absolute strength will be good, but nothing compared to freakish ability in this pulling motion. [url]https://www.google.com/search?client=firefox-b-1-d&q=pull+up+record[/url]
Andy Ruiz is clearly a gifted athlete in spite of his weight. But, this video shows that in less than 3 minutes (a time frame of paramount importance to boxers) his cardiovascular conditioning is beginning to fail him, and he starts making mistakes. It is a piry he lacks the drive and dedication to make the most of his god-given talent.
He can pull things up to his mouth many times no problem. Pulling himself up to a bar though... depends on the grip. Palms facing towards him - yeah, he should be able to do a couple Palms facing away from him - no way.