Fascinating post Aaron, and an great example of why comments, linking and blogging. Just starting to follow the links in this comment took me into both familiar and new; people, places and ideas.
Just on the comment quote, your post, a comment exemplifies the power of commenting from your own site. A comment on Tom’s would probably have tripped the too many links flag for spam detection.
I do wonder how you approach commenting on sites with out webmentions, like Tom’s? Do you regard them as notes to yourself and your readers rather than replies?