Is Nonbinary ever a Multi-gender compromise?

Many persons with multiple personality have both male and female alternate personalities. And some such persons outwardly appear neither male nor female, because their male and female personalities have compromised.

I don’t know if a multi-gender compromise is a common or rare cause for persons to experience themselves as nonbinary.

And I expect that most nonbinary persons will not be interested in this theory, because they either don’t believe in multiple personality or think that anyone who had it would be mentally ill.

But multiple personality is real, and most people who have it are not mentally ill; for example, most novelists.