Throughout the course of the college football season, anything can happen to a team's roster. Players can get hurt, some redshirt to save eligibility, others decide to transfer, etc. Ohio State was remarkably healthy last year and kept its top recruits in Columbus but that trend should not be expected to continue forever.
Already, the Buckeyes are down a key running back after an injury and a number of other players were dealing with ailments before the start of practices. Because of this, depth is always one of the most important aspects of roster-building. While a lot of attention has gone to the thinner position groups, such as the secondary, Ohio State is remarkably deep in other areas around the field.