Hm, as for my characters and the shooting...

Mike could be actively searching for his sister showing that despite her being such a bitch to him, he still cares about her somewhat and doesn't want to see her killed. Hey, maybe he could have been shot and hospitalized for a while. At first, Louis doesn't know that he got shot because he was looking for her but in the ten years after the shooting, she finds out and that's why she's trying to build their relationship back up.