It seems like after this huge victory, many of the 49ers fans got carried away and have set too high of an expectation for the 49ers secondary. The Cardinals' running game was not a threat for the 49ers and the Niners had just 7 man in the box in the most of the game. The team had double coverage on both wideouts all game long, which allows the Hightower to ben open underneath in almost every play. That is fine because Hightower is not a real threat. It was a good defensive game plan for Singletary and Manusky.
However, that scheme will not work for all teams. Teams with better running game will force the Niners to use 8 man in the box. And teams with a real threat with tightend, running back, full back as a receiver will force the Niners defense coverage to mix a little. The Niners defense is simply not a cover 2 based defense. You will see a lot of Michael Lewis close to the line of scrimmage in other games.
I still doubt Clements or any other corner's abilities to cover receivers one on one.
[ Edited by littleken on Sep 14, 2009 at 10:20:02 ]