The issue with Lou Anarumo with the Indianapolis Colts isn't how productive his defense is. The problem is that in the one season Anarumo has spent in Indy, he has never had his entire toolbox available. He has always been missing a key player or three.
The true indication of how good a coach Anarumo might be lies with his former team, the Cincinnati Bengals. Without Indy's current DC, Cincy has been atrocious defensively. Its offense has been fine, even while missing quarterback Joe Burrow for most of the year. It is Anarumo they have missed most.