Yeah. It's weird, because I got the impression during the series that Roku was supposed to teach Aang. Several times in season 1 Aang mentioned that he was supposed to meet/train with Roku after being IDed. And timeline wise, he was 12 when he was identified, but Roku was still alive because Roku was around to try to stop Sozin using the comet which happend within a few days of Aang starting his ice nap. But now that I think on it, it would potentially involve funky, soul-sharing wackiness. (We'll ignore that we went with alive-at-the-same-time that for the RP.)
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Mmm. Plot holes?