Contra Costa Times One way to move up the depth chart is to not have much of a depth chart in the first place. That's the position Cal junior Michael Calvin finds himself in this spring. The one-time heralded prospect is one of only four scholarship wide receivers on the roster, so never has the chance been greater for him to position himself for significant playing time this season. "I feel like I have to seize the opportunity," Calvin said. "This spring ball is going to make or break me. I just have to come out here and compete." Verran Tucker and Nyan Boateng have exhausted their eligibility, and Charles Satchell has moved from wide receiver to safety. That leaves Calvin, Marvin Jones, Jeremy Ross and Alex Lagemann as the only scholarship receivers left. The Bears signed five wide...

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