Monroe, if he can find his form from 2011 and 2012, would represent a substantial upgrade over McKinnie. Pro Football Focus graded Monroe as the NFL's 10th-best left tackle in 2012 and 15th best tackle overall. He was beaten for just five sacks and allowed 34 pressures overall. McKinnie was on pace to allow 52 pressures overall this season.
But just as important, at least considering how the first four games have gone for the Ravens rushing offense, Monroe is a willing and capable run blocker. He has received positive run blocking grades from Pro Football Focus in his previous four seasons while helping to pave the way for Pro Bowl running back Maurice Jones-Drew.
McKinnie has not been a consistent performer in the running game during his three seasons with the Ravens, usually doing just enough to get in the way. He is by no means the sole reason that the Ravens are averaging just 2.6 yards per carry this season, but only Oher has been graded worse as a run blocker by Pro Football Focus.
Monroe has not gotten off to a good start this season, but then again, he was playing for what might be the least talented team in the NFL, one that has been outscored by 98 points in four games. He allowed one sack and 15 total pressures. Maybe a change of scenery -- and a change of quarterbacks -- will get him back on track.