NFL stars moving from franchise to franchise after a career as the face of one organization shows the nature of the NFL. It's a wonderful game, but below the surface, a "for-profit" business lurks. Loyalty is spelled with $$$$ signs.
A commentary on the fragile balance the NFL manages between its standing as the colossal giant in professional team sports, and the underbelly of its mega successful standing as a business beast. When the players that create the beast become expendable, despite their exemplary service, the business portion of the beast casts them away. Don't feel sorry for the players, they usually find their way to continued pay days, but make no mistake, business is king, the game just keeps it fed.