If any of you are Potter fans, you're probably aware of Rowling's new website, Pottermore.com.  It's essentially like a bunch of expanded universe stuff, fleshing out the world these characters live in.  It's still in beta, so you can't just go and poke around.

This is all important, though, because it affects the canon of this game.  It was assumed, but never claimed in the books, that McGonagall was in school with Tom Riddle.  The Harry Potter wiki and Mugglenet.com both claimed this, and even had elaborate equations to back it up.  Pottermore has a more complete history of Minerva, though, and it's now clear that she's much older, and was not a student in 1942.  Neither was Pamona Sprout.

Should I replace these characters to match what is now the actual history?  And if so, with who?

Any suggestions?