In this recent interview with Gimelstob that posted on atpworldtour.com, Connors explained how Segura added everything else to his game that his mother didn't provide. He explained that through Segura he was able to meet Riggs and Gonzales, but Connors said that both his mother and Segura were the ones who were able to "get the maximum out of [him] without [his] even knowing it." Here is the video (Connors' discussion of Segura are made throughout the interview):
It appears that Segura is one of the most underrated coaches (and players) in the history of tennis. According to the International Hall of Fame website, "Pancho Segura has been fully appreciated only by those in the cognoscenti."