Quick thoughts after the San Francisco 49ers reached agreement on a trade sending quarterback Alex Smith to the Kansas City Chiefs:Credit Smith: Teams covet quarterbacks, but they haven't been shelling out huge money for unproven ones since the Kevin Kolb deal in Arizona. Matt Flynngot far less last offseason, for example. The success Smith has enjoyed the past two seasons, particularly in 2012, made him more appealing than the typical quarterback to hit the trade market.