1. QB comparison. There wasn't much to compare because these teams took vastly different approaches to the game. The 49ers removed quarterback Colin Kaepernick after one series. The drive started with Frank Gore breaking a 52-yard run. It ended with a field goal after Kaepernick overshot receiver Chad Hall for what should have been a touchdown. That was it for Kaepernick. Four plays, three points, two pass attempts, one completion and zero basis for meaningful analysis. Former 49ers starter Alex Smith played the full first half for the Chiefs and struggled, even against the 49ers' backups. At least three dropped passes hurt his cause. Smith completed 7-of-16 attempts for 62 yards, or 3.9 yards per attempt. The 49ers sent blitzes after Smith and roughed him up a few times, including when Tony Jerod-Eddie leveled his former teammate with a helmet-to-helmet hit.
2. Jenkins and WRs. Second-year receiver A.J. Jenkins was slow to gain traction for a second week in a row. Super-sized Chiefs corner Sean Smith roughed up Jenkins to break up one early pass. Smith also picked off a pass intended for Jenkins. It appeared as though quarterback Colt McCoy might have been expecting Jenkins to break off his route against pressure. Whatever the case, McCoy threw to one spot while Jenkins was continuing up the field. Jenkins did a good job reacting to trip up Smith, preventing a potential touchdown return. Jenkins also provided a block to help McCoy pick up a first down. All in all, however, Smith and the Chiefs' starting secondary smothered Jenkins throughout the first half. Jenkins did make a 21-yard reception against the Chiefs' backups early in the third quarter, but a holding penalty against offensive lineman Daniel Kilgore negated the play.
3. Rookie outside linebacker. Third-round choice Corey Lemonier got to Alex Smith with a strong inside rush against Chiefs rookie tackle Eric Fisher. I went into the game focused on Lemonier, but second-year inside linebacker Michael Wilhoite was the defensive star for San Francisco in the first half. He stopped running back Cyrus Gray for a 1-yard gain. He broke up a pass to Dwayne Bowe in the red zone. Wilhoite also made a tackle for a 4-yard loss on a punt return. The 49ers appear to have found a promising young backup for their all-world inside linebackers.
Note: I'm filing this after the third quarter because we're deep enough into the game for the key analysis to stand. I'll update if necessary.