Okay, I am somewhat perplexed by the theory of a rotating black hole. I know that there is a solution of Einstein's equations that shows a black hole can be rotating mathematically, but I find it highly likely that this is a non-real solution. Think about it. A black hole is a singularity, the tiniest point possible, surrounded by only a hollow area out to a radius which borders the edge, the event horizon. It seems to me that to say a black hole is rotating is to say that an empty area of space can be rotating. A black hole is not like a body, say a star or planet, that has materials in motion spinning through inertia. With a black hole, there are no materials to have angular momentum. Even if you tried to say that the singularity is spinning (as that is where the mass is) it occupies zero space, so it is equally illogical to say that it can have angular momentum. Further, the indirect evidence used to support rotating black holes, accretion disks and jets, seem to me just as likely that the materials are spinning around the black hole, not that the black hole is rotating.