Our sources in Indianapolis were shocked when the Colts announced Tuesday that running backs coach Gene Huey would not be retained after 19 seasons with the club. Head coach Jim Caldwell said in his season-ending press conference that he didn't anticipate any changes to the coaching staff, and Huey, 63, who coached more regular-season games (304) than any assistant coach in franchise history, was highly respected in the Colts' locker room. Team president Bill Polian also singled out the offensive line, but not the RBs, for the Colts finishing 29th in the league in rushing offense. But owner Jim Irsay posted the following on his Twitter page after the announcement: "There are complex workings within the inner sanctum of an organization. All cannot be revealed — some things are proprietary. Gene's a good man." We're told it's possible that the Colts, who are not satisfied with the development of Donald Brown, made Huey the fall guy rather than give up on their large investment in the 2009 first-rounder.