Weekend mail call:Jay from Meridian, Idaho, wants to know why I think TCU cornerback Jason Verrett is a good fit for the San Francisco 49ers.Bill Williamson: He is a fantastic player. Let's start there. Verrett is smallish and he is more of a nickel cornerback than an outside cornerback, but he has a chance to be a star from that position. Defenses are playing from the nickel often, so if you are going to have a nickel on the field, you might as well have a great one and Verrett can become that.