What's more interesting for me, as a TWR controller, is the fact that seemingly for qute some time TWR was oblivious to the fact that an a/c that landed, stopped on the rwy, is not proceeding and not calling. I know that's a big a/d and maybe it's difficult to see some parts of it, but there's surveillance, and last but not least, lack of the 'vacated' call should arouse questions.