I can name several prominent names that I would probably see as "negative indicators" on this topic (probably including Bailey), but I would definitely like to see if we can find some material on what DeWitt, David Sedley, and perhaps AA Long or other similar "luminaries" have to say about this topic.
There ought to be significant commentary out there on what we're talking about, which I think is pretty different from the general focus on "absence of pain," but more a comparison of this question of how can a man be "happy" while under torture / in great physical pain.