Speaking as someone that loves the tor and is always happy to make the walk to the top, whatever the weather, I guess I have to chip in. Nothing very illuminating to say other than I took down my dusty copy of a collection of essays about Glastonbury which includes various eminent authors including John Michell (published 1978). One of the articles by Patricia Villiers-Stuart is called Bend Me a Maze. She starts the first chapter -

The maze on Glastonbury Tor has only recently been discovered; what look like sheep or cattle tracks to the uninitated, Mr Geoffrey Russell assures us are really its labyrinthine curves. And so they should be. Mazes to the ancient world may have been what atomic stations are to us, power centres.

So in that one sentence the essay already seems a bit dated; how we relate to our planet has changed in the last thirty years. I haven't got time at the moment but will read through the entire chapter later and come back with a comment if she says something I feel I can take on board.

PS: Lunatic? ... a long time since I heard that word used, perhaps better to stick to 'crank'.

Well looking at the Rahtz book, and the fact that an I/A settlement was on the top, and of course the two bodies of the supposed monks in the rock cut graves; the sequence of settlement could be read as pagan shrine/roman temple/christian, very similar to other hill top sites in Somerset.
So a maze can't be ruled out, though whether mazes went that far back into history I don't know..spirally path up the Tor maybe equals easier way for pack animals to take stuff up there?