I found this a fascinating kaleidoscope of views. Most of the writing I've seen either keeps the Master as relatively static or reflects on a contrast or two with the Doctor, I don't think I've ever seen one that creates such a panorama. Very interesting read, thanks.
The last line gives chills. I wonder a bit about saying that the Master met Four more than Five though. The Master was in quite a few different Fivey episodes but as far as I know he only met Four twice.