The Schwarzschild radius of the observable universe is 10 billion light years. Me thinks that for the mass to be compacted into a smaller space at some point i

The Schwarzschild radius of the observable universe is 10 billion light years. Me thinks that for the mass to be compacted into a smaller space at some point in the past, it would have either had to escape it's own event horizon (since under most current definitions it would be a black hole), or the definition of light-year had to have changed from what it is today. In that regard, the only thing making up the definition of light-year is distance and time; so space-time itself was radically different way back then (from our current perspective of relatively low energy densities).