>>The only OL loss would be Renfro. Retention should be the goal.<<The only OL loss would be Renfro. Retention should be the goal.
I don't think they need a large group of players on D. Get the defense alignments and assignments squared away. Add a couple of top DL, a few LB's and a safety or two. 5 or 6 key guys would make a huge difference, IMO. Retain and train the rest.
Illinois isn't that far away despite lacking overall talent compared to the top P2 teams.
Forgot - add Dez Schuster to Renfro - but regardless the OL is in good shape next year - other than maybe tackle depth depending on current player development.