Light speed orbit likely is not at twice the event horizon radius for any size black hole, but there will be a circular orbit at 0.999c at some multiple of the event horizon radius; perhaps 1/5 the radius for a typical super massive blackhole.
What goes on inside the event horizon of any size blackhole is as speculative as most of the topics in ATM = against the mainstream. That will likely remain true even if a black hole passes within 10,000 kilometers of Earth.
For super massive black holes, it seems to me, the event horizon is a sizable volume from which multistage rockets could escape, if their fuel has sufficient energy density and they have sufficient reaction mass.
If we assume the singularity has a radius in the Planck length to pico meter range, then the average density of the singularity is one google = 10E100 times the density of water. Stuff spiraling into that surface is traveling almost c and suffering colissions, so it is very hot = trillion degrees c in my opinion. The temperature at the exact center seems irrelevent. We could argue that there are no molecules intact, so there is no molecular vibration and thus it is cold, but that seems bad logic to me. Neil