Willie ParkerSo the Redskins signed two-time Pro Bowl running back Willie Parker to an incentive-laden deal yesterday. What does this tell us? Well, for starters, it cements that the Skins’ front office obviously has no qualms about giving shots to backs that most other teams believe are washed up or a liability off the field: the depth chart now includes returning starter Clinton Portis (age 28), Parker (age 30), and fellow free agent signing and…