Speculation is the most we can do right now, Dazai. Figuring out the whydunnit may get us a step closer to finding out the whodunnit.

[ hee hee tori's lem2 days are coming back to bite 'em in the ass. ]

But this only proves that Giovanni's murder was caused by a separate person. If our killer wanted to take down two people, then he probably should have taken down the other bishop which, following Battler's example, would have probably been you.