Please don't read this as I think inflation, and a subsequent accelerating expansion is wrong. I think it is a very likely description of our universe. But those arguments above, and more, is what I go out from, trying to guess how it could be. I simplify it by getting rid of the 'container', treating it locally, doing so 'propagation of light in a vacuum' becomes something different to me. The ways to think about it is like mirrors to each other, you can get change without a propagation, and I think you can get a distance defined too. Instead of using the assumptions we built constants from, I prefer to puzzle :) from the assumption of constants being what create a universe, observer dependently.