4. THANK YOU, I was looking for that page you linked. I agree that Spade is an extremely likely candidate, and I've also got my eye on Vongola Secondo for the same reasons. And if the informant turns out to not be someone involved in the Primo/Cozart fiasco, I'll be very surprised.

Incidentally, I love that this is a manga in which dead people are just as reasonable an option as the living in cases like this. XD

AND I CONCUR. M-me too, sob.