Vanilla is a product of Lussumo:
Documentation and Support.
do you think Connor is in love with Alice? My impression was that it was always more of a protective instinct on his part.
If he was behind the mortar, I'm sure his intention was to blow up the Freakcave and not actually the FreakAngels, just shake them up because he's angry with them.
I don't think it was he, though I don't want it to be Mark either, because then he'd be behind everything... that's just annoying. Mark as big threat is great, but as source of all threats, not so much.