The plurality is achieved by reduction of symmetry from total to something less. In the Big Bang, symmetry was total to begin with, all forces were one, all matter was one. As soon as the expansion began the loss of symmetry began. Not cause and effect, but the plurality of the four kinds of forces in the present universe is associated with the low order of symmetry.
The one, the Big Bang, the void are three different donkeys, each one carrying a stupendous amount of peculiar historial baggage.