HBP predictions assessment - and a New Theory

When considering how right or (mostly) wrong I'd been on the predictions, I came up with a Brand New Theory (didn't we all?). Details of that at the end, but for now, here's my take on how well I did. Actually, I didn't do quite as badly as I first thought - I got a lot of minor things right, but struck out on most of the really speculative predictions.

( Assessment and theory, both naturally spoiler laden )