Leverage, Strength, Mobility, and Intelligence, in equal proportions, are the key ingredients for a NE Offensive Lineman. If you examine the five returning starters you see guys who use excellent technique, are naturally strong, and get themselves in position to execute their assignment quickly and smoothly.
Ohrnberger is a little light with reported weights ranging from 291-302, he needs to consistently hold his weight in the 300-305 range, but he's reported to be a very good technician. He has excellent mobility, he's obviously strong to be a three year starter inside for a Big Ten team, and as a noted team comedian he's clearly bringing the necessary intelligence to the job. Finally at 6'2 1/4" he's generally going to win the leverage battle with DTs.