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This is the one area that has been Oakland's Achilles heel all season. Currently the Raiders rank dead last in allowing 5.2 yards per carry as well as allowing 141.4 rush yards per game (ranked No. 28).
The problem, however, is mainly due to the DTs and DEs getting themselves out of position. The Raiders have three defensive linemen with four or more sacks, so their aggressiveness if being used against them.
Now include their age, and youth is needed. Richard Seymour is 32, Tommy Kelly is 30 and John Henderson is also 32, all of which are DTs.
Therefore, when they finally draft in the second round (traded first-rounder to Cincinnati), Alabama's Josh Chapman is a perfect fit.
Chapman has been the man in the middle for Nick Saban's Crimson Tide and is the next dominant defensive lineman coming from Alabama. Chapman's best attribute is stuffing the run as he's not a sack-master.
However, that's exactly what Oakland needs. He's a guy who can hold a gap (or two), take on multiple blocks and make plays or free up the LBs to make plays. In addition, although he's a very good 4-3 DT, he allows the Raiders to go with a 3-4 front to mix it up.
There, Chapman is actually better when stacked over the center, but his 4-3 ability is solid as well. So any way you slice it, Chapman will significantly improve the Silver and Black.