Free agency means finding right fit on field, in locker room (The Associated Press)

No matter how much a team needs a top cornerback to fix a porous secondary or a left tackle for a struggling offensive line, adding a veteran means finding someone who plugs as seamlessly into a locker room as into a coach’s schemes on the field. A wide receiver might’ve caught more passes if only his quarterback had more time to throw the ball, or that quarterback’s line didn’t protect well. Before agreeing to a big deal, a chat with his own players is a must for a general manager, assuring himself that a free agent will meld with teammates.
Source: Yahoo.com