>>58554997
>>58555049
If regigigas is just "a giant" in the vague sense they would have used 巨きょ人 like they do specifically for the lesser Regis that are a different clade from regigigas who is きょだい which is explicitly the same specific "Race of extremely large giants" distinct from every other mention of "giant" or "large."

You always revert to English equivalents without rending the flame plate and Earth plate in Japanese and coinciding the term with Regigiga's description.

I dare you to find me a single japanese person that will read the flame plate and Regigigas' description and not say that they are both conveying the exact same specific linguistic notion of a "Very Specific Extremely Large Race of Giants." The only way to really convey the term in both contexts is to say here it is saying "Giantest Giants" relative to 巨人 which is just "Giant" in the vague adjective rather than a proper noun.