Originally written on Scout.com: USC  |  Last updated 9/19/12

SAN FRANCISCO - AUGUST 22: San Francisco 49ers tight end Vernon Davis #85, San Francisco 49ers center Eric Heitmann #66, San Francisco 49ers guard Chilo Rachal #62 and San Francisco 49ers guard Adam Snyder #68 run out onto the field in to start the game as the San Francisco 49ers host the Oakland Raiders at Candlestick Park August 22, 2009 in San Francisco, California. (Photo by David Paul Morris/Getty Images)
The Bears promoted Chilo Rachal to starting left guard this week. Yet with all of the movement along the offensive line so far this year, Rachal realizes his grasp on the position is tenuous.
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