RG3 “really sore,” but “fine” after rib injury

Redskins quarterback Robert Griffin III received rib X-rays after Sunday’s loss to the Panthers.  The X-rays were negative. Per a source with knowledge of the situation, Griffin is “really sore.”  Though he said after the game that he’s “fine,” we’re told he expects to have a rough night sleeping. The Redskins are off next week,…