With the NFL draft looming less than a week away, let's break down the San Francisco 49ers' draft needs in order of importance.CornerbackWhy: It's the only position on the field where the 49ers currently have a hole. Tarell Brown departed in free agency and Carlos Rogers was cut. They both ended up in Oakland. The 49ers could easily take multiple players at this spot. If the right players are added, the 49ers could bring in a starter and a nickel cornerback.