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I guess what I'm arguing is nobodies can grow hearts and that would not rule him out.
Disclaimer: I don't support him being Riku's nobody but obviously versus Noctis'.
She is still classified as a nobody, there's nothing that indicates Yozora doesn't have a heart and is even stated that he has one even if it's been replaced with another. And if anything it will probably tie in to some ability he has that allows him access to the 'dead' once we know more about him.