FW Pilot here.
Perhaps the the type of departure chosen was precisely because there was a good chance it would be filmed being as they were departing the scene of a Premiership footy match. I think if the eyes of the world were on you, you would conform with the procedures in the book to prevent a polite request to come to Gatwick and explain why you didn’t do it by the book, should that type of footage become available to the chaps down there.
That might explain why one option was chosen as opposed to another? Not sure.
I’ve learnt a lot reading this thread. Thanks for education. Apologies for chipping in if the above is irrelevant.