The thing about a black hole is that the singularity is actually a forward point in time relative to the outside.

Space and time are the same, so in a space where space is bent so hard that everything falls in, time is likewise bent wildly out of shape.

So basically what this would imply is that the big bang is the point at which the black hole finally exploded and unleashed the built up matter that all reached finally the singularity point at that instant.