Five years, $50 million extension for David DeCastro

Steelers guard David DeCastro has a new contract, and plenty of new cash. Per a source with knowledge of the deal, it’s a five-year, $50 million extension — the largest contract the Steelers ever have given to an offensive lineman. He’ll receive $18.1 million in 2016 (he was due to make $8.07 million under his…