Can Isaac Guerendo break the 49ers' curse of early-drafted running backs?

49ers Webzone - The San Francisco 49ers have drafted many running backs in the top half of the draft over the years. Some have been hits, like Roger Craig (1983, second round), Ricky Watters (1991, second round), and Frank Gore (2005, third round). Others have been misses, like James Owens (1979, second round)...