That's not an argument: Being a dinosaur doesn't make you necessary stronger. Old Lac would be crushed by most superhumans, and even by humans. Regarding the Hulk's incarnations, there could be a battle. But the Green Scar (the Hulk during World War Hulk) didn't had much problem with Hulk, Juggernaut and a Iron Man Hulkbuster's team, I don't think Stegron would have much a fight to offer, just because he is a dinosaur.
Also, he has a dinosaur form, but he is a human mutated by a Lizard Formula.