Lex is Bant, 50% chance Lex is also Sarkan (scried as Bant villager). I'd think that makes Lex the most dangerous player I know at this point as Sarkan can protect the whole Bant team tonight so they won't lose any members tonight if Sarkan lives.

That said, Grixis is currently the biggest threat to us all with 2 night kills and 4 players so if someone can provide me with the identity of a Grixis killer, I'd be more than willing to switch.