Steelers get their deal done with David DeCastro

And then there were eight (unsigned first-round picks). After Detroit signed 23rd overall pick Riley Reiff this morning, the Steelers have followed suit, getting 24th pick David DeCastro signed, according to Ed Bouchette of the Pittsburgh Post-Gazette. The guard from Stanford will get a four-year deal worth $7.814 million, per the slotted system that makes…