In this article, Jerry Koosman tells what Rube meant to the club from professional and personal points of view. Being both a friend and a mentor created a strong relationship between himself and the Mets pitchers. Focusing on the mental aspect of the game more than mechanics worked out well, too. Perhaps more ex-catchers ought to become pitching coaches like Walker and Dave Duncan did.

Koosman goes on to say that Walker never received the credit he deserved for the team's mound accomplishments. He didn't stand out in the overall picture, but that's just how it is with coaching staff members. Rube was neither the manager nor one of the players and did not get much publicity. The coaches of a major league team can be considered the invisible men of baseball.