I think V1 may be Dave, a descendant of Damien Vesper. After all, his name is an anagram.
Using process of elimination, I've eliminated:
Isabel Kabra (V2)
Mike Rosenbloom (Rapid Fire 7)
Arthur Trent (It just doesn't seem possible)
I meant MARK Rosenbloom Oops, stupid typing.
there are lots of clue leading to arthur . he was a vesper after all and knows dan's secret only he and dan were supposed to know .
V-2 faked the Arthur texts. But how did she know about "Moonface"?
More pajamas? LOL
What do you think?