I am not 100% about Jason being at the battle next month, but if he is there for a while, I'd like for him to make an attempt on Kirei's life, if that's all right with you! There is a very good chance he will be at the battle for a while, at least, and while plan Kill Everyone is something Jason might ultimately freak the fuck out about, taking out someone like Kirei is definitely at the top of his to-do list.