Answer based on context:

The 1996 campaign was the Suns first losing year in the SAL. First basemen Mike Whitlock led the team in home runs (20) and RBI (91) with a .252 batting average while drawing a franchise record 108 walks. He did this in 131 games at the age of 19, yet never played a game in the major leagues. Another player who displayed power was Craig Wilson (first baseman). Wilson hit 11 home runs with 70 RBI while maintaining a .261 batting average. Craig Stone returned from the 1995 squad, batting .310 with 10 home runs and 35 RBI in 56 games. Mike Johnson (1990s pitcher) won a staff-leading 11 games and also had a team-leading total of 162.2 innings pitched. He made his major league debut a season later with the Baltimore Orioles. Tom Davey won 10 games and had a 3.87 ERA in 26 starts.

How many more RBI did Bobby Cripps have relative to Vernon Wells?
21