Density/Dimension clarification

[βαθμιαίος]

So if we've established that all densities are existing in the same universe at the same time, what could Ra mean by this? I suppose it's intended to mean what third density can observe, but it really sounds more like they're talking about different space/times. Very confusing.

Not sure, but I think it just implies that the same event would look different from a fourth-, fifth-, or other density perspective.