Dear Constantinos,
Perhaps nobody in the community will be surprised when we show that Pentcho is wrong. Only Georgina found your 4. claim interesting. You wrote:
"My argument to Pentcho that all observers are at rest relative to 'empty physical space'. Since otherwise an observer would need to be 'apart and outside' this physical space which defines existence in our Universe. Thus explaining CSL."
If observer 1 is in motion relative to observer 2 then I wonder how they both can be at rest relative to empty physical space (Israel Perez's aether).
I will avoid a discussion with Georgina because she follows Albert Einstein who made the observer an issue. While observers are of course not outside reality, I see processes in the objective reality quite independent from any observer except if he is involved in the observed process. I suggest you will discuss with Georgina elsewhere unless there is a connection to my essay.
Pentcho got it: "Michelson and Morley should have calculated and expected the NULL result". I am sure this is definitely an annoying surprise to many physicists and also exciting and unbelievable to almost every layman.
Best regards,
Eckard