Gilbert coached in the World League of American Football ( WLAF ) for the Frankfurt team in 1991 and 1992 and returned to San Diego State for his second stint as an assistant coach .
Gilbert estimates he coached approximately 2,500 players during his career .
Gilbert , who estimates he coached approximately 2,500 players during his career , coached in the World League of American Football ( WLAF ) for the Frankfurt team in 1991 and 1992 and returned to San Diego State for his second stint as an assistant coach .