Ooh, I'm so excited by this, despite being late to the party.
As I understand it, scoliosis is actually pretty common (it's kyphosis that isn't - if I've spelt that right). Most people develop a bit as they get older, in modern society, because we sit for too long and with bad posture. Carrying things that are too heavy wouldn't help, either. So I think it wouldn't be surprising if he did have it, and yet it wasn't much mentioned - I mean, you're not going to go up to the king and say 'ooh, mate, bit deformed aren't you?'
He was a very pious man, though. Something I find slightly creepy is that he had a Book of Hours (and legend has it he was praying with it before the battle), and after he died Margaret Beaufort nicked it. She's always seen as this really pious, devout woman but I think she must have been a battleaxe! She didn't even bother to cross out his name properly, so it must have been like a trophy.
I love all the rumours/conspiracy theories about who the body might be, whether it's him. I grew up near Leicester, it'd be good to think he was there!