Good read thanks for posting!
Also a big Viola Lee Blues fan. I think the Butterfield Blues Band had a huge influence on the early Dead as well as many of the other Bay Area bands. The Butterfield Band were already accomplished musicians breaking new ground at a time when a number of the Bay Area bands were still learning how to play and develop their own sound. I had the East-West LP before the first Dead LP came out and always thought the blueprint for Viola Lee was East-West.
Interesting Elvin Bishop sat in with the Dead a number of times but as far as I know Bloomfield never did. I saw a photo of him jamming with Jerry but not on stage.