Caldwell didn't do any magic with Flacco. Wacco was not very good this year at all and quarterbacks don't all of a sudden go from good to great in a 4 or 5 game stretch just because of a coach. He simply got hot last year. It may have coincided with Caldwell coming in, but it could have been more of a relief than anything that Cam was out.
There's also no coincidence that Rivers had his best season in years and Mathews had the best of his career this year and all this despite losing their top two receivers before the season. Whisenhunt missed badly on Kolb, but a la a Belichick from his Cleveland days, it's sometimes that first experience that pushes you to success in your second go around after learning from the mistakes.
Tom Brady looked like *** for half a season when he lost his top targets.
The Raven's lost Anquan, Pitta and Ray Rice had some of the worst advanced statistics a starting running back had all year,
When Jim Caldwell took over as Peyton Manning's OC his completion percentage went up every year.
Jesus Christ couldn't have made that Raven's offense go.
When you have a terrible o-line, and no weapons, your offense isn't going to be very good. Caldwell will do a good job if he has some firepower to work with, which he will in Detroit.