‘The NFL Coaches Association recently sent a letter to Bills owner Ralph Wilson and Commissioner Paul Tagliabue asking the club to release coaches or guarantee their return. The Bills are apparently waiting to see if Williams’s replacement wants to retain his former staff members. Tagliabue doesn’t intend to get involved, according to Greg Aiello, the NFL’s vice president of public relations. “The coaches are under contract to the club,” Aiello said yesterday. “It’s not a league issue.”‘