Who do we suspect of being the green one?
Regarding Gur. There's a theory that the goblin was supposed to kill someone at night, at least I don't see any reason for him not to do it. This immediately raises several versions, in which Gur is at best the goblin, but more likely an orc, even if he's not a killer. The only thing that could disprove this theory is the alchemist's poison, but I don't see any reason to use it now, when any delay could lead to a complete collapse.)
There's a third person hiding somewhere, I agree with Yashur that we should look in the poll, although I don't rule out the possibility that the third orc didn't vote to avoid suspicion.

