Nick Baumgardner Detroit Free Press Published 4:00 p.m. UTC May 23, 2018 (NOTE: This is the first installment in a series examining Michigan's position groups this offseason) The most important piece is in the middle. For Michigan, in 2011 it was David Molk. In 2015 it was Graham Glasgow. More: Michigan football hoping Cesar Ruiz is first answer to complex OL puzzle Simplification of terms and overall comprehension were the buzz concepts this spring for the Wolverines with new offensive line coach Ed Warinner. But the real catalyst for Michigan’s quest toward becoming a functioning front five again resides at center: Cesar Ruiz. “Helping direct traffic. Your center makes a lot of calls in there that set your protections. If he sets them wrong, you've got problems. ... He's been very good at that this spring," Warinner said this spring. "We go through all the looks, have our rules, it's all coached up. But you can tell him in meetings and then go … [Read more...] about Michigan’s offensive line has potential, but how much?