By Mike PrestonThe Baltimore Sun 2:00 p.m. EST, January 13, 2013 The improvements in the Ravens offense during the past two weeks can be contributed to the play of quarterback Joe Flacco and the play-calling of offensive coordinator Jim Caldwell. But the most significant improvement has been the addition of left offensive tackle Bryant McKinnie. McKinnie has started the past two games, forcing tackle Michael Oher to the right side and Kelechi Osemele to start at left guard. Since then, Flacco has rarely been touched and getting more time to throw. Just think: If the Ravens had made this move earlier, they might have been the No. 1 seed in the postseason and playing every game at home. Oh well, at least they got it corrected in time to make a serious run.