The 49ers play the Bears Monday night at Candlestick. In the meantime, I’ll break down five key matchups. DE Julius Peppers vs. OT Joe Staley and OT Anthony Davis Peppers had a terrific game against the Texans last week, recording 1 sack, 1 QB hit and 2 hurries. Peppers is one of the best pass rushers in the NFL. He rushes from both the right and left defensive end positions….