I don't know if anyone has a literal "soul" theory. As I said I would personally go with "embodiments", and then it doesn't matter whether the embodiment is male, female or both.
What I believe is that sometimes they needed to embody something that was inherently male, but there was always a pull towards the feminine side for the physical representation, which is why we ended up with a few men, many women and an undetermined number of "it's complicated".
I believe it could help us a lot if we understood why the tendency to draw women was so strong that there are more gender-confused figures in the MS than unambiguous men.
What I believe is that sometimes they needed to embody something that was inherently male, but there was always a pull towards the feminine side for the physical representation, which is why we ended up with a few men, many women and an undetermined number of "it's complicated".
I believe it could help us a lot if we understood why the tendency to draw women was so strong that there are more gender-confused figures in the MS than unambiguous men.