Oh, for sure, and to be fair, my response was not meant to be a rigorous logical statement, since it was in response to a jest about Sandman comics :-) However, I felt there was some truth to it so I defended it anyway.
I'm quite comfortable with the idea (original or not) that opposing concepts can both be true simultaneously. Your opposite generalisation does sound very interesting too. I'm going to write it down in my little idea notebook for further thought some day :-) Thanks!
(Thinking about it now, putting both these statements together appears like it could well need to a very interesting Borges-like story)