Well, here's the line-up for the first album...
- Bobby Caldwell / drums, percussion, vibes, bells, piano, backing vocals
- Lee Dorman / bass, piano, backing vocals
- Rod Evans / lead vocals
- Larry Reinhardt / acoustic, electric & slide guitars
It looks like for Sufficiently Breathless they just added a whole bunch of people
- Lee Dorman / bass
- Rod Evans / lead vocals
- Guille Garcia / congas, timbales, percussion
- Larry Reinhardt / acoustic electric & slide guitars
- Marty Rodriguez / drums, backing vocals
- Reese Wynans / acoustic & electric pianos
+ Paul Hornsby / organ (5)
Then by the time they got to Dawn Explosion they were... uh... Sufficiently Stripped Down. This line up also doesnt include Rod Evans!
- Bobby Caldwell / drums, percussion, backing vocals
- Willie Daffern / lead vocals
- Lee Dorman / bass, strings, backing vocals
- Larry Reinhardt / acoustic electric & slide guitars
I don't know how each of the line ups came to be either, maybe Wiki would know?