Biggest surprise: The Saints knew it was significant when they signed Darren Sproles soon after the lockout ended. They had traded Reggie Bush and were looking for someone to replace him. But I donít think even the Saints realized how much of an upgrade Sproles would be over Bush. Sproles turned out to be the best free-agent signing in the entire NFL and was a big reason the Saints went 13-3 and set all sorts of offensive records. Sproles had been a very nice player in San Diego, where he played the role of speed back, receiver and return man. Sproles took on all those roles in New Orleans. But he was used quite a bit more as a runner than he ever had been by the Chargers. Sproles averaged 6.9 yards per carry and also caught 86 passes for 710 yards and seven touchdowns -- all career highs.
more; Saints regular-season wrap-up - NFC South Blog - ESPN