I would say that Archie Moore has all the credentials and then some of Bob Fitzsimmons and certainly more than Sharkey. Jeffries knocked out some lighheavy/cruiser types, the best of which were very old, one who was basically retired for all intents and purposes. Archie KO'd 120+ dudes all over the spectrum, up to a fit and ready Bob Baker, who was KO'd only by Bob Satterfild and Clarence Henry. I'm giving the nod to Moore... and actually Walcott, too. 3 inches in height? Was The Rock 5 foot 9? Jeffries did a lot of throwing his weight around against the wharfbrawler Sharkey and got bloodied for his trouble. Marciano was a master of slipperyness and not giving the other guy a handle. Jeffries, at his modest 6 feet (an inch taller than Marciano), would only be inviting slaughter with those tactics. Going by the Ruhlin film, he would catch more leather than the old Union Pacific during a buffalo stampede. His marks in high jump and sprinting are good for a junior high school girl. I'm sure that will come in handy. You're not very good at guessing, my friend.