Why is Oil at a $100/barrel Speculation or Just the Fundamentals

"It's been rumored Goldman Sachs has over $80 billion in the market, although the investment bank declined comment for this story. Its influence is so big, traders refer to the day of the month when the bank sells the current month contract and buys the future month as the "Goldman roll" due to its effect on price. When Goldman last month told its clients to sell oil when it approached the mid-90's, crude lost over $3 in one day."-I'll bet they(GS) were short oil in off shore places.