Quick GoF Continuity Question with spoilers behind the cut

[heidi]

What happened the random kid from PoA who said that catching Sirius would be like catching smoke?

I still don't understand why Percy was cut from the World Cup scenes, and I don't understand why the hedges ate people and I don't know why Nigel was there instead of Dennis, who could have just had the name wihtout the whole link-to-Colin explanation, but I expected that kid to be back, and he wasn't. Also, was I wrong that there was a new Pansy? WHY? I like Louise!Brooks!Pansy!