A good example [1] of someone learning a piece without knowledge of the underlying theory. I find it magical because he was a teenager whose dad gave him a Joe Pass record, and he learned All The Things You Are when he was laid up with an injury and had too much time on his hands. He ends up playing it for his dad, who's impressed.
He doesn't realize that the chords sort of follow a ii-V-I pattern, and I'm sure eventually he learned it. Would he have learned the song faster if he'd known that? Maybe.
He certainly knows all the theory now. He has a really good ear, in his videos he listens to a song for the first time, playing along on guitar or piano and naming all the chords and progressions as he goes.
He doesn't realize that the chords sort of follow a ii-V-I pattern, and I'm sure eventually he learned it. Would he have learned the song faster if he'd known that? Maybe.
[1] https://www.youtube.com/watch?v=34hQvMhHL34&t=3s