This is going to be a brief post for two reasons. Firstly, this episode doesn't add anything at all to the debate whether Number 6 is John Drake or not. Secondly, I'm afraid I don't really have much of a take on this one that hasn't already been said endlessly by everyone. Except for this one thing - is it not obvious to everyone else, as it is to me, that The Kid is actually The Butler? The silence & the top hat convince me of this. Another reason for passing over this one so fast is I want to rush on to the next, which happens to be one of my all-time favourites.
This episode can be read as a commentary on the Vietnam war, of course. Kanner is absolutely superb, no really, superb as The Kid, chilling beyond belief.
Sadly for my conviction that Number 6 is John Drake, I feel for the rest of the series the identification will become unsupportable. With George Markstein gone, the series goes in the direction McGoohan wanted it to.