Try this website to get an idea of how the speed limit of light was ascetained and its ramifications.
Short Words to Explain Relativity
in the last part of your post is this item.
"all being aligned to a focal point somewhere in the direction of the initial instant of the Big Bang."
This occurs because the universe is composed of space-time which is to say like the sides of a coin what happens with one as a rule affects the other.Notice that you use the word POINT(space)and the word INSTANT(time) together in the sentence.Space tells time its direction, time tells space its sequence.
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