The San Francisco 49ers have played 1,631 defensive snaps over the past two regular seasons with Patrick Willis and NaVorro Bowman on the field together, according to ESPN Stats & Information. They have played 30 snaps with both on the sideline.So, when injuries prevented either from practicing Wednesday, the 49ers were in an unfamiliar position.Willis re-injured his right hand and was expected to undergo X-rays, according to Matt Maiocco of CSNBayArea.