I'd suggest the escort stays hidden, if everything goes right then he should then be able to stop the WWs from killing anyone every second round, right? That would be incredibly powerful for us. The flipside is that if he dies after a while, we still won't know who the alpha wolf is - but it's probably worth it if we can prevent another 1-2 wolf kills before that happens. And of course the escort still has the option to reveal himself if he feels like he is going to die soon, either through lynching or being eaten.