I guess, yes .. It is possible that the posted image of an account is really existing in the game because you've just captured a screenshot of it .. jokes aside, that account might be a dummy account of someone, who only opens their account to spend the Coupons from the Will of Fire comeback event .. Just like what the other players are doing this days to fish some rare ninjas from wheel events .. So that's the case also of why you didn't see it in action .. Or maybe there's other reason, reason that the owner only knows ..