 He admitted to becoming more forgetful with play calling and clock management as he passed his 60th birthday, and to being a bit unwilling to adapt his offense for the NFL of the 1980s, although he was not totally to blame for the Cowboys' problems, which included years of poor drafts.Schramm, Brandt, and other longtime personnel were soon gone as well.Jones replaced Landry with University of Miami head coach Jimmy Johnson.