Baronlando said:

I saw the Spartacus reconstruction in a theater and you'd never know it was that far removed from the negative. And that was years ago, Harris probably can do some amazing things now.

Maybe it's not that far removed from the o-neg, maybe he did develop a way to only use one of the 3 masters for fine detail (which would be the equivalent of using an IP in terms of grain and detail but the resulting image would be black-and-white with wrong levels) and then using all three to give it proper colouring. It would be a process similar to colourizing a black-and-white movie.