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He probably could have? Like he has more viltrumite DNA than his dad, he may be stronger than him even at a young age.
Not really no one other Viltrumite will become stronger than Mark Greyson because he kept fighting lots of viltrumites in his younger years and his body adapted to their Incredibly Powerful Punches and he even fought the strongest Viltrumite and managed to survive getting punched by his a lot without his fist going straight it to his heart like Nolan and he pushed himself way too much and when he was 18 and 19 years old so when he is a 100-year-old viltrumite he will become even stronger because Viltrumites get stronger with Age so he is way above all the Viltrumites