I think tyson, lewis nd holyfeild would have a chance to be him with lewis being the most likely as i think he would have a chance of outboxing ali nd also i think joe louis could of beat ali nd he would have gave marciano his first loss had the fight happened when he was in his prime. nd yes i do think ali would stop wlad in 6 but im not sure if he could stop valuev but he would definately outpoint him with ease