SAN FRANCISCO — Mike Vrabel saw the potential greatness in quarterback Drake Maye long before he was hired by New England to lead its franchise. Maye’s top target, Stefon Diggs, was a bit behind on that. Vrabel, in fact, revealed Wednesday that having Maye on the roster had a big influence on him wanting the New England head coaching job. “I probably realized that before I got here,” Vrabel said of Maye’s potential. “That’s a large part of the reason that I wanted to be here. Everybody has a