Good thoughts provide here. I agree that it is easier to get offensive talent to Eugene, than defense. Bigger, fast, strong, works on both sides to the ball. The perennial top 5 teams recruit better and thus have better players than their opponents, and as they execute well, points naturally follow. Oregon will probably recruit at slightly under that level, so offensive creativity will, and should be a part of the offensive game plan.
Top interior D lineman will usually be at a premium at Oregon, but top linebackers and DB's should be able to be recruited here. Again a little creativity will be necessary to reach the elite team level.