Gordie, if you are truly wondering why McCall left, I will suggest this: glug, glug, glug...hic....
I am sensing a smidgen of revisionism regarding him. Sure he signed some decent/key/great players, but I am sure anyone with the resources within a full time job could do much the same. However, getting them to play their to their potential and make them fit into a team takes talent, ability, skill and sometimes genius. Things that were in Jackie Macs and now in Archie's CV, but not ever in McCall's repetoire.