If you ask me, it's a toss-up between Woodson and the D-line as a whole. Mainly Jenkins and Pickett.
Jenkins is doing such an amazing job. You know that you have a good 3-4 DE when the offense is double teaming him because of his rushing abilites. He doesn't have to work to take two guys out of the play, the OCs do it for him.
Pickett is horribly underrated. The man is absolutely amazing. He's our one-man wall. How often have we seen him work his way through a guard and a center and still get the RB down for a loss? This defense falls and stands with its NT play and Pickett is holding his own, to say the least.
But, in the end, I have to go with Woodson. Teams either go around him and just don't throw in his direction (I don't think that Flacco targeted him even once) or throw at least one pick to him and for the most part still shut down the receiver. That's absolutely amazing. And this is not only in man, this is in zone, as well. How many corners do you know who can play zone just as well as man? He also plays safety, covers TEs, covers the slot, blitzes up on the line of scrimage, shuts a receiver down with a 8 yard cushion, shuts a receiver down playing press.... It's just amazing.
And, the stats speak for themselves. Huge amount of tackles, leading the league in ints, returning 2 for TDs, forcing fumbles, just making game changing plays. He's just off the charts this year. He gets my vote.