agreed. "then play on" is still blues-derived, tho you can hear them veering into sort of cosmic folk/psychedelia. to me, the next one, "kiln house" is the real transition from the peter green straight blues to their eventual AOR/pop guise--kirwan's "jewel eyed judy" and "tell me" are classics, tho i also dig jeremy spencer's rockabilly stuff.
Excellent comments Marty on Kirwin's contributions to this band. It was a magical time, certainly not having the commercial success of the Nicks/Buckingham period but offering a major contribution to the body of work of this special band from their inception. And time goes by. 
I was a fan. Regarding the earlier stuff, after PG, then came the Bob Welch/Danny Kirwan era, which I found gratifying.