So the changes are to power, strength and durability (He gets them equal to Foreman) and his height is scaled to 5ft10. What remains is his stamina, speed and style can Sun Kil Foreman overwhelm and stop the Lion? He weighs 210lbs and holds the weight fine before you start picturing him morbidly obese.
Sun Kil Foreman is now the best heavyweight h2h. A heavyweight with Moon's stamina can never exist without breaking the laws of physics.