Episode 6 teaser cuts to a pretty out of it young female saying,
"The man with the scars- he made me watch."
Could this be in reference to the pastor's assistant- the one that served time for child indecency and got clipped in the jailhouse showers.
These characters are really the only that haven't been revisited, and the Pastor (Eli from BE) I believe does have family influence high up in state government.
Church flyer was on yellow paper, the Yellow King is still out there, and his constant moving around, makes for a convenient means to subvert detection always on the go and other than a tiny spiral mark on the victims, very little MO of a serialized killing.