Here is where I think the Steelers can make the weakness of the last few years into a strength for years to come. With the 56 pick int he draft, if he is still there, I would draft Kelechi Osemele OT Iowa State.
He will need to be coached up, but his skill set is there, he can play RT (with Gilbert moving to LT), can play G (imagine a line of Gilbert, DeCastro, Pouncey, Osemele, Colon from left to right). I would move DeCastro to LG cause he can pull/trap effectively, whereas Osemele was never asked to do so.
Further, you would protect yourself as each DeCastro and Osemele give you postiton flexibility, as DeCastro can play C, G, RT, and Osemele can play G and RT. This would be helpful should Colon suffer another injury this year.
From NFL Scout: Osemele may be stronger than he is big, which is saying something. While some players use a strong base and others rely on a powerful upper body, Osemele has both. He has incredible reach (35??-inch arms and an 85??-inch wingspan) and massive hands (10 3/8 inches) that make him hard to escape. He seems to enjoy using that strength most on run blocking, where he overwhelms defenders. He is a bit more tentative as a pass blocker and must work on recognizing what is happening there. A hard-working student on and off the field.
They only other position I would consider drafting in the 2nd would be ILB, and the only player with a grade high enough here would be Mychal Kendricks. If both are available I would be torn but to me it is far more important to keep Ben upright, so I would still pick Osemele.