I think you miss one of the major influences; the Scottish tunes and many of the Irish tunes/lyrics. Maybe these evolved out of the "old time music" but these are major inlfuences.

I disagree with GA Crakcer's comment re: Monroe and Scruggs. Like or not there should be emphasis on their influence - and their commercial influence was NOT done by design, as it is today. These created a musical genre and the commerce followed.

Good article, all things told, Ritchie. Thanks!