First, there is the same old so-called problem of space needing something to expand into. This is not any kind of problem whatsoever. This is purely and simply a case of buzsaw being unable to shake some conventional assumptions about flat space. Expansion simply means that there are greater separations between things over time. You don't NEED anything to "expand into". This is one of the really fundamental things that needs to be comprehended.
I agree that it is not nonsensical to state that space can expand without any need of something to expand into.
IMHO, it WOULD be nonsensical to state that space WAS expanding into something.
Ultimately space is what expanding objects expand "into" - while we might place bounds on the region of expansion by referring to some other factor (usually one which places a limit on the expansion) all expansion is an increase in volume and therefore the occupation of more space. But it would clearly be nonsensical to state that space was expanding into itself.
I think Buzsaw's problem here is a failure to understand the implications of the fact that it is the expansion of space itself that is being discussed.
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