hmmm,,, assuming is not to scientific is it?
I'm trying to see for myself how it's possible to see the difference between the two, expanding or shrinking, It's just a view of perspective without changing the rules of physics.
If space was an entity he wouldn't say he was getting bigger, he would see mass is getting smaller and visa versa, there is no other reference
Both are maybe even irrelavant because there's no way to tell the difference, like trying to find out who is moving, the airplane or the earth under it.