Nunca surgiu realmente
Eu tenho medo de que não haja muito mais a dizer sobre isso, nunca houve o momento certo para injetar esta informação. Naturalmente, quando bons autores escrevem suas histórias, eles vêm com muitas informações adicionais - e com Rowling e Harry Potter, isso parece ter sido especialmente verdadeiro - mas nem sempre se encaixa perfeitamente em um enredo e seria feia e desajeitada para tentar calçar essas coisas de qualquer maneira. Daí coisas como Pottermore .
Isso é o que Rowling tinha a dizer em uma entrevista na TV que ela fez com Daniel Radcliffe (atualmente disponível aqui ):
By the time that I said that [revealed that Dumbledore was gay], I had been working on these characters for 17 years. Now, not many writers have ever been with the same set of characters for that long, so I feel I can sort of speak for all of us who have to say it becomes a very intense experience. And, inevitably, you are gonna know things about characters (and I'm - characters in the plural) that are not - in some cases will be relevant, and you'll think 'oh yeah, yeah, this is the moment that becomes relevant and I will say that, or show that.' For example, Professor McGonagall. I had a whole history worked out for her that I think I thought at some point would become relevant. That she'd had a love affair with a Muggle and that she'd had this quite tortured past and she ended up being this celibate, elderly teacher. Um - never became relevant. Never happened.