If Peter could've stayed in the the line-up just another six months, his future would've been very different. The Boston Tea Party shows would've been released the same year as "Live at Leeds", and "Get Your Ya Ya's Out". That album would've changed the band in the U.S.. Even if Green had left at the end of 1970, his legacy would've been sealed in America instead of his cult status among musicians, and anglophiles in the states. One listens to those concerts in the winter/spring of 1970, compared to concerts from '69, and this is a band on the verge of greatness. By 1970, they had figured out how to balance Spencer, Green, and Kirwan songs that didn't bore the audience. When I first discovered this version of FM years ago, you heard "acid casualty". Being a Syd Barrett Pink Floyd fan I know what "acid casualty" truly was when Barrett could no longer play with Pink Floyd on stage, and stood still in silence. From the live recordings that exist after "Munich", Peter Green was playing his very best.
P.S. thanks dansven for the work it took to post this.