Center Matt Birk’s retirement meant the Ravens had no chance to bring back their entire starting offensive line from the Super Bowl, but they did the next best thing.

Re-signing left tackle Bryant McKinnie after McKinnie flirted with other teams allows the Ravens to put four-fifths of that line back on the field when the 2013 season gets underway. Throw in the fact that Gino Gradkowski, Birk’s projected replacement at center, has a year in the system under his belt and the Ravens have strong continuity from the 2012 season. That makes quarterback Joe Flacco a happy man.