Yes, sounds like he skipped Ayler and went to the source. I do remember reading about a small, very local pentecostalism that developed from some of the post Civil Wars sects and had survived in the Downs certainly into the 50s, documentation suggests. I wonder if a young Butcher came across them whilst seeking out local cisterns in which to practice.
Also, just remembered Prevost's mention of the Diggers and Muggletonians and their influence on the early structural identities of improvisation in East Anglia. Possible cross-pollination?
Have to say, I agree with your wife