Kevin Gemmell Starters in, starters out. That’s college football. Players’ eligibility expires, and they leave for the rest of their lives, whether that includes the NFL or not.And they leave behind shoes of various sizes that need to be filled.Our concern with this series? The biggest shoes -- in some cases Shaq-like size 23s.Biggest shoes: David BakhtiariQuantifying the impact of an offensive lineman is always difficult. Quantifying the impact of an offensive lineman on a one-win team that was either last or near last in the league in almost every offensive category is even tougher. Originally posted by ESPN.com - Pac-12 Blog Click here to view the article.