The oft-forgotten members of the Cubs College of Coaches were those who never got a turn as being "head manager."
Bobby Adams (1921-1997) was a talented infielder for the Reds for a decade, and a useful utility man for the Cubs in his final two seasons as a player (1957-58). He was released after playing in just three games in 1959. He became a coach in 1960 and was part of the "College" all four years. He moved into the front office of the Cubs' AAA club for six years, then returned to the majors as a coach in 1973 before retiring.
Dick Cole (1926-2018). The outsider. He played six seasons in the majors, mostly with Pittsburgh, got a late moment in the sun with a small role for the World Champion Braves in 1957. He played another 12 seasons in the minors, retiring as a player in 1959. He was part of the Cubs staff in 1961, but also spent much of the year in the low minors, where among other things he taught young outfielder Lou Brock how to bunt. In 1962, the Mets hired Cole to manager their NY-P club.
James "Ripper" Collins (1904-1970) was the graybeard of the College of Coaches, having already retired from the game to enter the retail world. But the Cubs hired him to be a roving minor league instructor (he had a nine-year MLB career and once led the NL in homers), then moved up to the big league coaching staff in 1961. During the season, he was moved to Class AA San Antonio to manage them. He was scouting for the Cardinals in 1969, he suffered a series of heart attacks, the last being fatal.
Charlie "Jolly Cholly" Grimm (1898-1993) managed the Cubs in 1960 -- his third stint after overseeing games from 1932-38 (32-36 as player/manager) and 1944-49. He also helped build the mid-50s Braves, being fired early in 1956. He was manager early in the 1960 season, but the Cubs swapped him with play-by-play man Lou Boudreau. But he was brought out of the radio booth and restored to the coach staff from 1961-63. He then moved to the front office until 1981, two years before his death in 1983.