Gravity! A speck containing all of the universe could not just start expanding.<quoted text>I don't see that.
Every law of physics would be broken.
It just could not have happened that way. And to top it off some claim it was a slow expansion. Also if this speck was a spinning Singularity if it broke apart then everything should be spinning the same way.
The Conservation of Angular Momentum tells us that in a frictionless environment, if pieces fly off a spinning object they tend to spin in the same direction