Words of common gender are exclusively used as applied to the qualification of Senators.

The noun "angel" being of common gender suits the case admirably, and the epithet is sure of being favorably received.

And whether, therefore, the third head of indefinite propositions were not as superfluous as the so-called ' common gender' of nouns in grammar?

Maybe because it's already a female-dominated field, potential casting directors will be women too, because gendered professional fields tend to also perpetuate that common gender.