I'm not surprised at Foreman's gabble. He's much better at selling grills than he is at giving boxing analyses. He boosts up Liston because he himself tried to pattern himself after his hero Liston the illiterate "leg-breaker" gangster. He boosts up Frazier, because he himself beat Frazier so easily. Which means he's saying that HE... "Big" George, would slaughter Klitschko. He wouldn't of course, it's just talk, and he never had the skills. And actually, in this boxing era "Big" George would really only be "Little" George..... Klirschko would likely beat him up badly, with Foreman hardly being able to lay his usual ponderous bludgeon anyhwere near him.
Besides, I am always a bit hesitant about believing a fighter who not only hears voices in his head, but also, even though a devout Christian, believes in witchdoctors...... Of course maybe he wasn't so devout at that time, but he certainly heard "messages from above".......... He himself has even mentioned it several times, and seems to think it's NORMAL.
I'll let others decide.......