After ‘unbelievable’ performance, 49ers’ O-line preps for Cowboys

SANTA CLARA — Brock Purdy, Christian McCaffrey and Brandon Aiyuk piled up impressive numbers in the 49ers' Week 4 victory over the Arizona Cardinals. But let's not forget the efforts of the offensive line. "Yesterday, they were unbelievable," 49ers coach Kyle Shanahan said Monday on a conference with Bay Area reporters. Purdy dropped back to throw 22 times in the 49ers' 35-16 win. He completed 20 of 21 pass attempts. He was sacked once and was pressured just three times in the game. Shanahan said the 49ers' line faced its biggest challenge in Week 1 against the Pittsburgh Steelers. On Sunday, they will have a big task ahead of them to contend with the speed of the Cowboys' Dan Quinn-coached unit. Edge rusher Micah Parsons leads the Cowboys with four sacks through four games and is considered a favorite for NFL Defensive Player of the Year. "It's always great to watch film on them," 49ers center Jake Brendel said of the Cowboys. "They are a dynamic defense. We've had success the last couple of years against them, but at the same time they are looking good, too. "It will be fun to watch that film and we'll just make sure we have a good game plan against them to bring them our...