Very cool, thanks for the input and the background! Always fascinating to see these things placed in historical context. As for your question:
John Fairbairn wrote:
Is it possible that the last katago example was a deeper training run?
These are all games from basically about the same point in the run. In any case, I would not expect move preferences to necessarily evolve in any particular way corresponding to how they did for humans - if it did, in large part it would be by chance as far as we're able to predict, because while bots have validated and resurrected a number of older ideas, and also validated a number of modern ideas too, they've also rejected just as many other human ideas, both old and new, coming up with their own judgments and internally-consistent style.