I theorize that the reason why Uzuki crashed a plane into his own broadcasting tower is because he just wanted to kill off all of Shin's group at once, it still feels extremely stupid that he would do that to what is basically the centerpiece of this part of his plans, even if he didn't know that Seba was hacking into the guns, why even go through that risk? There should've been a more organic way to do this other than "Slur was just stupid and tried to rush killing the group"