He should be crying a river by now after listening to you make all those 'paddo noise' filled 'porky pies', mate. Listen to the discussion with them more closely and you'll see where they are caught between Einstein's 2nd Postulate "rider' and a hard place. They have nothing left except more obvious troll tactics of evasion and distraction at all costs to the facts in discussion. How you doin'? Get a clue yet?
Still refusing to address the science...still on with your bleating/whinging/complaining, still trolling, still here...
Anyway, here's some more science for you to ignore.......
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Q: Are all the postulates in General Relativity accepted or does there exist room for alternatives to General Relativity with different outcomes?
A: Accepted is not really the right word. Many different tests that we are capable of performing IMPLY VERY STRONGLY that General Relativity in its most simple form, is the way that nature seems to work. This means that the underlying principles are also sound. Specific ones like the bending of light by gravitational fields and the equality between gravitational and inertial mass can be individually tested and have been found to be correct to within experimental error....one part in 10 trillion for the later test in fact. So far, there are simply no places to sneak a completely different theory that does better than General Relativity, and this is somewhat of a problem because without signs that General Relativity is in bad shape in some way, there is no maneuvering ground for introducing a 'better' theory. There would be nothing for the new theory to explain better at the current time. This also means that General Relativity as it stands is our best shot. But perhaps in the next century some new test will be discovered so that the field can progress further. Still..between curved space, black holes and the Big Bang, what more could you possible want to 'explain' by a better theory?
Q: Exactly why is the speed of light a constant in all reference frames?
A: Because it simply is, and this is an experimental fact of life that we have to deal with. It doesn't matter if you are on two cars moving in opposite directions flashing lights at one another, the total speed of the electromagnetic disturbance is the same, and is not augmented or reduced by your motion. The only thing that affects the speed of light is the refractive index of the medium through which it moves, and for empty space, this number is 1.000000 and gives you the maximum possible speed of light. In glass, it is 1.3333 times smaller since c/n = c/1.333 = 300,000 km/sec/1.333 = 225,000 km/sec.
The invariance of the speed of light in all uniformly moving reference frames is a postulate of special relativity, it does not derive from special relativity, which only then states how observers will experience/measure space and time given the invariance of the speed of light.
http://einstein.stanford.edu/content/relativity/q1917.html
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Now tell us again about my porky pies, and other fairy tale ignorant vengeful names you may like to call me.
If I have lied about any of my scientific comments, I'm sure you would show it to be a lie, if you could......
Again undefined, your efforts to convince the sensible folk on this forum, re your silly alternative model, can be analogous to pushing shit up a very steep hill.