I think that if students in the upper years show up, then they're fair game. But it's all down to whether they're interested or not. I tried my very best to convince Barney and he wouldn't budge, not even when my eyes started welling with tears. So, I'm afraid that Delacour's probably not interested either, Weasley. But it's probably for the best, considering. Now Diggory, I'm not so sure...

As for how I know about the other teams' plans... I don't know anything for a fact, but I haven't studied acting so seriously and not picked up a thing or two about character traits.

Also, people have a tendency to talk freely in front of Milli, not realising that she is actually capable of listening and remembering.

That's precisely my point about Goyle - he'll listen to Draco without question, and he's very resilient, besides.