Jim's whole journey was pointless
He accomplishes nothing the entire movie, you'd think he was gonna kill Jerry, or at the very least provide a distraction to save Stephanie or the mom but he doesn't even do that. He arrives at the house and stands there like a dumb ass with his gun not even out despite knowing this is the house where he's at, and he gets killed.
The most you can say he did was provide a gun for the mom to shoot him but even then the gun shots isn't even what killed him it was Stephanie stabbing him in the chest with a knife.