If you were to rank Purdue’s biggest worries entering 2019, the offensive line would be at or near the top of the list. It's vital for the line to develop and protect quarterback Elijah Sindelar so he has time to find and utilize a strong collection of skill-position talent. No unit is under more pressure to come together.

The program has anchors at the tackle spots in Grant Hermanns and Matt McCann. But the interior remains a work-in-progress. The center spot is especially troublesome. And the spring did little to quell concerns. A potential wild card: the addition of a grad transfer. Stay tuned. This is a young unit in transition.

The roster has just two senior offensive linemen, and one of those—Alex Criddle—is a recently converted defensive lineman. Here is how we would stack the offensive line depth chart coming out of spring practice.