This should throw a cog in your calculations. https://www.reddit.com/r/Physics/comments/jljj5s/why_no_one_has_measured_the_speed_of_light/
Then there is 'Spooky Action" or quantum entanglement, and that seems much faster than the speed of light.
At the current growth rate of the Universe, their distance will increase by 0.007% (corresponding to 1.4 million light years) in one million years, which is clearly faster than light.
Another idea is that the speed of light was once faster: Hmmmm?
‘For a pair of physicists, that century-old notion simply reads: Challenge Accepted. João Magueijo from Imperial College London and Niayesh Afshordi of the Perimeter Institute in Canada proposed a new experiment proving Einstein wrong and demonstrating that the speed of light actually isn’t a constant. The pair thinks light may have moved faster in the past, around the time of Big Bang, and that it’s actually slowed down since.’
So many possibilities, I think I will withhold drawing any kind of conclusion for now.