I interrpreted a previous post #45 as implying the universe could expand without matter/energy.
The original assertions "The Big Bang was an explosion OF space, not of things in space". And I responded that "space without matter is an oxymoron". See posts #45, #72 and #80.
An expanding universe absent matter/energy is a meaningless concept, i.e. oxymoron.
As I said before, in an empty universe it's all moot (more extreme than the "if a tree falls in the forest and there's no one there to hear it" question). But following the Big Bang the universe was not empty; it did contain energy and matter. So your objection is beside the point, unless I'm missing something??