Racing PositionsQB shuffle: Ravens sign Lewis, waive Vaughan6YJamison Hensley49ers set for complete quarterback makeover6YNick WagonerKaaya vs. Douglas is matchup to watch in Russell Athletic Bowl6YESPN Stats & Information49ers working to keep free agents but lack building blocks6YNick WagonerObjective No. 1 for 49ers: Get through Broncos game without another QB injury7YNick WagonerChristian Ponder hoping to catch up quickly with 49ers7YNick WagonerMore than one quarterback competition to watch as 49ers open preseason7YNick WagonerBlaine Gabbert, Colin Kaepernick co-starters on first 49ers depth chart7YNick WagonerNew 49ers QB Thad Lewis: Chip Kelly a 'very smart, intelligent man'7YPaul GutierrezLewis signs with 49ers, is fourth QB on roster7Y