@Nilgiri
With your permission, I wish to reproduce your written point-by-point summary of the three videos.
TO OTHER MEMBERS:
While it is impossible to follow the discussion without looking at the three videos, it is also impossible to have the discussion in the first place without Nilgiri's masterly precis of the discussion. I disagree with him on several points, but those disagreements do not alter the fact that the precis is essential reading to go through any analysis and interaction on what was said in the videos.