The important thing the cosmologists have overlooked is that although the speed of light is a constant, time itself is slowing down so things which are further away APPEAR to have moved further than they should have. This also shows that it wasn't a big bang - more of a little pfffft but since time was faster then, it looked more impressive.
OK. I admit I don't understand any of this cosmology stuff but it makes as much sense as dark energy. (Occams razor and all.)