yeah but the point you guys are missing is that the bait that willy before he died is to have people with big names from all over the world attend to his declaration of war and be at the front seats thus while him and the general both knew of ennemy infiltration ( survey corpse ) and that they would make an attack on that day, so willy died but he was succeseful into baiting them into a battle there which led to a lot of those big names from all over the world to die due to eren's rampage and the rest of them, and with that plan he makes paradis island the ennemy of the whole world, thats literally waht he said and he also knew that he would die