There was a video interview a couple years ago with him explaining it. I'm pretty sure he said he has some internal scar tissue that makes his hip or leg really tight and fucks up his skating in his normal stance. Hopefully he's healthy enough to film a part.
I can't remember who put that out, but he got under his car in his garage and used a car jack and macgivered his shit knocking his hip back into place ala Mel Gibson style in Lethal Weapon. He made the analogy/comparison of those times you roll your ankle, you can still skate a certain way, i.e. switch. This is how he lead into the whole, "I'm goofy thing..."
So in other words he rolled his ankle like his hip. He rolled his hip like his ankle, I mean. He had that sequence of a goofy footed kickflip one foot nose manual up the manny pad at pier 7, been waiting for the footage. Daewon has had lots of new footage since then, but I don't think anything released by Almost. So I'm guessing it's all saved for the Almost video. Which should be sick as fuck.