As you say space was expanding that I agree with. If there was any difference in the gravitational dragging of the core of the micro black hole and the event horizon a structure of gravity would form.

I am probably a bit simple here as the reference I would use is the sun. If it were in this position the matter of the sun could not travel as fast as the hyper inflation. If like a black hole it could maintain an event horizon then that event horizon would keep up with the inflating universe.

Big assumption here the micro black holes formed after the big bang had a centre which was not able to expand at the same rate into the newly inflating universe as its event horizon.

Cheers