When you watch a lot of old fights, when a fighter is knocked down the ref doesn't send the other fighter to the neutral corner. Many fights would consist of 10 - 20 knockdowns. Which fighters do you think would suit those style of rules? If refs let the fight these days go on for as long as they did back then. Who would thrive on that? I guess it would come down to the heart of a fighter, right? So does that mean Khan would be have suited the 30's more?