Draco:

I would have to agree with you there. If anyone can investigate him, they should.

I still find it a tad strange that the claim that Cho was Mafia came right after Ron's claim of being an insane doctor and all of this Myrtle business... if it weren't for Neville's 'investigation', it is likely that Myrtle would be a bit closer to lynching... Perhaps Myrtle has a power role in Mafia and is simply playing it like she does to make everyone think she is simply a newbie or a very bad player...