re: Hypothetical: Pelini back as DC?

Honest question. I think Chavis is better than Pelini, but our last 4 losses have the defense on the field and cant make the critical stop. It's got to be a play calling/scheme type of problem. Our "very proud LSU defense" has really let me down as a fan. We've recruited 5 stars on the defensive line but they havent produced as well. So who do we blame? I say it's schematic.