This discussion may contain spoilers!
I've seen alot of threads about the ginger guy being the killer, but here's my theory on why he can't be the killer.
When Bigby and Snow go to the Trip trap their taxi driver is the ginger guy and when bigby gets out of the car, we can see the ginger guy by the fire (see picture below), this either means he has a twin brother or he is just a reused model.
I personally think that the ginger guy is just an reused model and that he isn't the killer.
What do you guys think? Let me know.
(Sorry for my bad english, I'm from the Netherlands.)