We can see things moving faster than light

I Have a question and I am not a physicist so please forgive any observable ignorance but, In the video you keep mentioning that the radius of the observable universe is always moving away from us and therefore all of the galaxies that we can see are moving away from us at the speed of light + the actual expansion of space itself. However isn't that earth-centric. Surely some galaxies started their trajectory from a different position relative to us and are therefore moving at a rate from the point of the big bang and not us, that is to say, the hypothetical galaxy that we can see moving isn't moving from us at all but from the point of initial expansion, it may be moving away from us relative to the angle of its trajectory alongside us with a calculable allowance for its trajectory from the centre of the universe to ours. I get that the observable universe is a fixed point from where we are at any given time but the periphery of that surely means some things will be moving expansively not away from us but a shared point of the beginning of the universe. Aren't galaxies moving directly opposite us relative to the big bang point of expansion actually moving at twice the speed attributable to them singularly? If all Galaxies move at the same rate from the expansive origin. Are they actually moving or are the debris on a wave expansion of space? Does the rate a galaxies mass influence it's movement from wherever the expansion started? As I said not a physicist but would welcome some clarification, thanks!