[RamsInfiniti]

Here is the change from 2006 to 2007 after the hiring of Roberts:

KO Returns 2006 21.3 AVG 26th in NFL 2007 23.6 AVG 9th in NFL
Punt Returns 2006 7.5 AVG 25th in NFL 2007 11.9 AVG 4th in NFL
KO Coverage 2006 24.6 AVG 28th in NFL 2007 27.2 AVG 32nd in NFL
Punt Coverage 2006 9.1 AVG 19th in NFL 2007 9.1 AVG 18th in NFL

Hard to explain why KO coverage regressed. However, like I said, it was much better first half of the season ...