[Spoilers Main] Any theories you've done a complete 180 on?

The first time I read the fAegon Blackfyre theory I was pretty against it, more than anything just because it felt like an unnecessary layer of complication. I barely knew who the Blackfyres were or why they should be relevant - they have what, a dozen mentions in the main series? But then I read Dunk and Egg, and did a reread of the books, and suddenly all the evidence looked a lot stronger. "Some contracts are writ in blood," indeed.

I'm firmly behind that identity now, to the point I'd be shocked if he's ever revealed to be anything else. Have you ever completely reversed your position on a theory?