Without giving the man credit as such he was certainly an almost perfect manipulator. A machine of a predator.That's a great observation, and eloquently put. I know exactly what you mean.
Like others have said, he was hiding in plain sight. Easy to see now, but back then he wove such a web of deceit it was hard to get at him, let alone act on it.
I honestly believe he is almost impossible to categorise when it comes to his personality disorders. They must have been multiple.