We know the observable universe was part of the big bang and is expanding, maybe even because we're observing it. We have no concept of whether that dense spot

We know the observable universe was part of the big bang and is expanding, maybe even because we're observing it. We have no concept of whether that dense spot was all there was, and there are a whole slew of other caveats, so it could even be orders of magnitude larger. Our current knowledge is functionally zero in the grand scheme of things.