Dear Helmut,
Thank you for further clarifying your views on physics and metaphysics vis-a-vis my essay. Though you highlight differences, I choose to highlight agreements. There are several.
As to the differences, you write
"You are f.e. claiming, that there is only a wave-like face of c (i.e. light is propagating as a wave), but not a particle-like one. (Hence, your conclusion: Einstein's CSL Postulate contradicts his Photon Hypothesis.)"
This is not a claim! It can be mathematically proven that if the speed of light is constant then light MUST propagate as a wave. Your metaphysical argument for the 'two faces of light' is interesting but suspect.
You write, "I am working on a specific set of metaphysical properties, like OMNIPRESENCE, INVISIBILITY, ONENESS, ABSOLUTENESS etc.. To any of these properties we can state, that their physical meaning is still unknown."
I accept the 'physical meaning' of such abstractions is unknown. But I ask you, what is the meaning (any meaning) of such terms like, ONENESS? And if such terms are not 'objectively defined', how can these be used in our 'objective reasoning' we seek to communicate to others? Or we must first be 'believers' before we can 'understand'.
In my own thinking I DO make sense of such terms as you've listed. And I can even say I 'understand' some of what you argue. And use such 'metaphysical reasoning' to guide my thinking. Just as all physicists do in their own way but never acknowledge or perhaps even know. And this is a key point in my essay!
All the best in all you do,
Constantinos