Amidst the fast-paced world of the NFL, rising stars can make their move out of the pack overnight if the right opportunity is provided. 49ers rookie safety became a beneficiary of that opportunity after making early impressions during training camp and the preseason, and Kyle Shanahan is keeping close tabs on the young defensive back. With Mustapha out of commission, the 49ers turned to their rookie to fill a starting spot, a testing ground that would show his preparation and composure at the professional level.

Shanahan was upbeat in his assessment of Marques Sigle after the 49ers’ season-opening 17-13 win over the Seattle Seahawks . “Since training camp, he’s jumped off the practice field. He did well in the preseason games. We had a feeling about this guy from the first w

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