Auto, glad to hear it wasn't the sprag clutch, I thought it a remote possibility anyway.
I do wonder however, what could have caused the helo to shed all 4 rotor blades as well as both rotor hubs. I hope they quickly discover the cause, because if any failure can be labeled a "catastrophic" failure, this one certainly can. I note that the preliminary NTSB report indicates minimal leading edge damage to the rotor blades. That suggests something internal to me (either mechanical or pilot), but I could be wrong. It's a massive failure so I'm very curious as to the cause, but we'll have to wait and see.