For life of me I cannot recall another 'police investigation' in Fear or TWD. We know Rick was the sheriff, but he kind of never did the investigative part of the work. Not really. John, different story, but for once he's back in the old job, investigating a murder.
We know that the family members are usually the first call for suspects, but Janine ain't the murderer. In fact, for John to find the sapphire earring in the ground suggests a higher value person than the washing lady.
Funny fact is that Ginny had ordered the victim to read J&J's love letters, and she was demanding John to drop the investigation and go with the captured suspect makes her more likely candidate than Janis. At least from a story perspective.
The evidence, if it would have been handled properly, could have revealed something else. It's just there ain't no prints and collecting DNA at Kirkman's world, since there's no electricity, databanks or crime labs. But for the sake of the living, John's right. The man didn't walk by himself to get hanged in the barbedwire fence.
Then Dakota suggested that her sister is trying to hide something. I cannot think any self respecting person with a police background could've left the idea behind and just get on with the daily routine. Although I know that some police actively avoid getting involved, but if you're in it, most certainly.
Most strongest piece of evidence was the torn log book page in the armoury. No ordinary person could have got the murder weapon checked out, or even to destroy the evidence. Then Janis made a false confession, leaving out the detail of how the death actually happened.
So, the question is why Ginny killed Cameroon, or why she's protecting the murderer? Without knowing the details it is hard to say anything, because all of it would be just speculation. All confirmed by Jacob by delivering his observation through Janis salvation prayers.
The rabbi acted as he if knew that Janis didn't do it. That he knew both why Ginny and John had done their deeds. A man of faith who everyone confess despite there's no need. Was he playing it or was he into the knowledge?
Funny thing is how Strand got involved in order 'to save John' from doing foolish thing, like getting killed while trying to murder the leader of the rangers. For a police he should have figured out a better way than stomping through the town with a gun in his hand.
I think we all get revenge, but for John to be the executioner, it's not going to happen.
So the guys doing the message knew the bounty hunter and the key is still in the play. What does it unlock? The lock is five pinner, unknown what is on the other side, but I doubt it's anything other than grooves. I can be wrong, but I think the prop department wants us to think it's a high security lock. Too bad Morgan wasted both suspects and lost the answer.