Carnivore 69 wrote:
Wilt Chamberlain was under 2:00 for the 880, and I have no doubt he would have been under 5:00. 275 pounds.
I made the Wilt post before I saw the post about Kevin Willis (itself based on some info from a Sports Illustrated piece which may be have nonrigorous data), but now that I think about it, Wilt is probably the best candidate for "the job." The job is not necessarily the status of the athlete at a certain point in time but their potential. Obviously, athletes towards the very tall end of the prospect pool can push the limits of weight--distributed amongst their larger body--with less detriment to overall athleticism, control and running ability. But that seems to be less of a certainty and more of a theory the taller you go.
After reading your response about Wilt's 880 time and this number ("275") which is high, I think Wilt Chamberlain is probably the tallest guy who could run pretty fast and stand to weigh a lot and even gain more weight. I'm not really confident/informed about the range of his weight over his career and life. But this is just hypothetical, counterfactual, of course.
Let's set aside the man's personal preferences during his lifetime--long NBA career; intellectual, cultural, social and entertainment interests and engagements; and other sports. Say Wilt found the motivation to achieve the heaviest sub-5:00 miler in history status, and was willing to set aside participation in said peripheral activities that might be excessive (e.g. toning it down a bit to focus on specificity). With his weight lifting interest and social connections and resources, his natural strength and athleticism and ability to move his huge frame extremely competently, powerfully and quickly--maybe even give him modern technologies and amenities, Al Sal style--I think Wilt could have stood to put on even more muscle bulk that might not be entirely detrimental and even somewhat useful to his running and general fitness. I think he's the man for the job!