This week was a rough one for U.S. oil and gas giant Devon Energy (NYSE: DVN). Shares of the fast-growing shale driller tumbled on Wednesday after its fourth-quarter results missed the mark, falling nearly 12% for the week. That pushed the oil stock down more than 25% for the year.However, while the value of the stock has declined, the value-creating potential of the company has only increased given the growth it has in the forecast.