Let's take an early offseason look at the San Francisco's 49ers' pending unrestricted free agents:WR Anquan Boldin: He is vital. He is 33, so he may not get much interest. The 49ers might be his best fit.Percentage of return: 75CB Tarell Brown: The cornerback market was started last year and many starting-quality cornerbacks had to settle for less than they probably wanted. If that happens again, it could lead Brown back to the 49ers.Percentage of return: 55K Phil Dawson: The 49ers love Dawson and he loves them.