While the San Francisco 49ers have done well in free agency so far this offseason, there is still something of a dark cloud hanging over the franchise. Trent Williams, the Niners' excellent left tackle, has been engaged in a contract standoff with the front office. The team just declined his $10 million option bonus, and while he is scheduled to earn $32 million this coming season, it will be the final year on his contract. Even though Williams is 37 years of age, he apparently wants to keep