Osi changes his mind: Bob is now RG3

Well, that didn’t take long. This summer, Giants defensive end Osi Umenyiora said he wasn’t referring to Robert Griffin III by his initials and number until he earned it. “Who is this RG3 guy you guys keep talking about?’’ Umenyiora said on WFAN. “You talking about Bob Griffin? You guys are giving him a cool…