Now I see how the writers went about crafting their little arc and it's perfect too. When the show first started, I often wondered which of the Lamb's would fall prey to Vincent and now we know. Now that Jack is going out of his way to keep the news from Mia that he shot and killed her father and tampering with evidence to his involvement, this gives Vincent the pressure he has been looking for to basically have a cop in his back pocket. It's just a question of how far down the rabbit hole will Jack go to keep his secret...a secret.