Frankly, the DA and the police really don't give a crap about Jake. He's been a thorn in their side for some time now. Jake has to cooperate or he loses his deal - he goes to jail - presumably as a minor, but the DA probably could prosecute him as an adult given his age. Given Jake's history, the DA would probably be successful.
The DA has the gun that he believes Big Tony uused to shoot Jake. The gun can be tied into Big Tony. The DA still needs Jake's testimony...unless the DA gets his hands on one of the bullets from Jake's stomach. With the ballistics on the bullet and gun, the DA really won't need Jake's testimony. That leaves the DA the option of saying, "Look, jake, I don't need your testomony se we no longer have a deal!" Jake's screwd at this point.
The 3-way switch on the licence plates was ingenious!
Brett to the rescue. I'm anxious to see how this plays out.
May the fleas of 1000 camels nestle into Jake's dad's crotch!!