I speak with someone occasionally who is very plugged in to a very large number of coaches. He could not have been more excited when Miami hired Guidry. Said he is an absolute superstar coordinator. IMO we see some significant improvement this season.
Remember, if the offense is as good as we all feel it's going to be, you don't need to have the #1 defense in the country to have an exceptional football team. You just have to be complementary. Most good teams are somewhat balanced. If the offense really is, say, Top 20 nationally, if we have a Top ~30 defense, the team is going to be really, really good.