The 49ers didn't look good in their exhibition opener last week, a lopsided loss to the Baltimore Ravens. But judging a team based on wins and losses in August is folly. Starters don't play or only play a few snaps, teams keep their schemes simple and often it's the third-teamers – the ones the coaches most need to evaluate – who get the most playing time.So whether the 49ers win or lose in Sunday's second exhibition game against the Denver Broncos at Levi's Stadium doesn't mean a thing. Certainly, Pro Football Focus is looking at the much bigger picture. The analysts at Pro Football Focus this week released their latest unit rankings and pegged the 49ers' defense as the No. 3 unit in the NFL and the offense as No. 7. That certainly seems in line with all the offseason moves the 49ers made after reaching the NFC Championship Game last season. In particular, the 49ers have added extra pieces at running back, wide receiver and the secondary to help get them over the hump to a Super Bowl championship – a steep challenge considering the current champion Seahawks are in the NFC West, too.But ESPN.com's Bill Williamson, who covers the 49ers, believes there are some...