SAN FRANCISCO – There was a reason Kyle Williams dropped to his knees and – two pink gloves pressed together in prayer – looked toward the heavens following his 43-yard touchdown catch in the second quarter Sunday.

"It was for my grandmother," the 49ers receiver said of the celebration. "My grandmother actually passed away from breast cancer, so I'm always looking forward to the whole month – being able to wear pink and support it. And I got a touchdown today, so I was just saying hello."

A number of NFL players are wearing pink in honor of Breast Cancer Awareness month. Williams donned pink cleats and gloves and had a pink towel tucked into his waistband.

Entering Sunday's game, the 49ers hadn't had a play of more than 30 yards, and quarterback Alex Smith was criticized for not pushing the ball downfield.

Against Buffalo, Smith completed two passes beyond 40 yards – a 53-yard strike to Vernon Davis in the first quarter and the pass to Williams.

Smith threw to Williams' back shoulder, and the receiver stopped, caught the pass and accelerated into the end zone.

"Honestly, I've got to give (Smith) all the credit because he saw where the defensive back was positioned – he saw he was up high on me – and he put it in a place where only I could get it," Williams said. "He played great. He played awesome."

WildKap strike – Quarterback Colin Kaepernick made up for a fumble in the second quarter by rushing for 33 yards in the second half, including a 16-yard touchdown, his second in two games.

Kaepernick appeared as a quarterback and as a receiver, lining up next to Randy Moss on one play and then going in motion to take a handoff from Smith.

Kaepernick was a surprise addition to the lineup last week and averaged 10 yards on five carries. Sunday, he averaged 9.8 yards a run, proving the 49ers' version of the Wildcat – the WildKap – is difficult to stop even when opponents know it's coming.

"Sometimes, there's confusion," Kaepernick said of the opponent's defense. "Sometimes, it just messes with their responsibilities, what they're trying to do."

Smith said Kaepernick's appearances are good for the offense.

"It's another thing a defense is going to have to prepare for," Smith said. "You only have so many (practice) reps during the week to get ready. The more they have to think about, the better."

Sore finger – Only one 49er went into the Candlestick Park X-ray room after Sunday's game – the starting quarterback.

Smith said he sprained the middle finger on his throwing hand on his final pass, an incompletion to Davis. Smith scrambled for 25 yards on the next two plays and then left, presumably because the 49ers were so far ahead.

The finger was wrapped during his postgame news conference, and Smith is likely to practice with the injury this week.

Coverage breakdowns – The 49ers' kick-coverage units, the league's best last season, continued to struggle.

The Bills' Leodis McKelvin went 80 yards for a touchdown with his first punt return, but the play was wiped out by a holding penalty.

The next time McKelvin touched the ball, on a kickoff following a David Akers field goal, he returned it 59 yards and had to be chased down by Tramaine Brock.

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