Darian Stewart proclaimed himself the ''final piece of the puzzle'' when he joined Denver's ''No Fly Zone'' secondary last year. The NFL Network said it was worth $28 million with $17.5 million guaranteed. ''Thrilled he'll be a Bronco for 4 more yrs!'' tweeted general manager John Elway , who lauded the ''physicality, leadership & toughness'' the free safety brings to Denver's defense. More...