The term super heavyweight has no set definition. I view it as a boxer with the minimum qualifications: 6'3" or taller 230 pounds ( In shape ) or greater 78" reach or greater Not sure what you're getting at. I gave a general guide line of what a super heavyweight is. Your obsession is obvious here. I do consider Sanders a super heavyweight, and Byrd, as you know, was over 200+ pounds ( 40 pounds above the middle weight limit ), and lucked out of VK ripping his shoulder up during the match. I never said anyone can beat a super heavyweight. I did say if you add up all of Lewis, Bowe's, and the Klitschko's fights ( super heavyweight with skills ), they only lost one decision to a non-super heavyweight, so essentially outside of one razor thin loss, they aren't going to be out boxed by non-super heavyweights. Now if your size obsessed there is a list of champions who lost via KO or decision to men under 200 pounds, and it includes guys like Johnson, Dempsey, Louis, and Liston. Sorry to disappoint you, no modern super heavyweight with skills is on that list.
I suspect Jack would have to have eaten more pies and lard to becomwe a superheavy. But if he did eat 100 pies and lard blocks, he'd have been invincible,. because all that extra fat would make him invulnerably, faster, hit harder, mote accurare and massively boost his boxing skills. I have no idea why he didnt eat it.
But he was hovering around 230lb in 1916. Surely too big for a cruiser? And he didn't look pudgy, he looked muscular and athletic, with a little flab.
I believe Lewis, Bowe, and the Klitschkos are far better than past super heavyweights ( Willard, Simon, Carrera, B Bear, and G Godfrey ), and I distinguish them by saying they are " super heavyweights with skills." In time, I believe Joshua will pass men his size 50 years ago too as he is big and more skilled than they were. He just needs more time to add more wins to his resume. In case you haven't noticed, big guys with jabs, skills, and power have pretty much dominated heavyweight boxing since 1990. No motive, we are talking facts. The days of heavyweights 6 feet or shorter without big time power being the linear / Ring magazine champion are over and have been for decades. I think it bothers some, but it's true. So there you have it. I defined the loose qualifications to become a super heavyweight and some 6-foot guy with a 74 reach and extra weight is not a super heavyweight at all. So nowyou can admit I'm correct, unless you have some ulterior motive.
I typically think of a super heavyweight more in terms of height than weight, which I know sounds weird. But I think it's any heavyweight 6" 4' and over. For example, Wilder is only about 225 lbs but I consider him a SHW due to his height and reach.