Free agency 2013 live blog: Day 4

This is the live blog for Day 4 of free agency. I’ll update this frequently with information and analysis.

According to Akbar Gbaja-Biamila, the 49ers are in “serious talks” with Nnamdi Asomugha and Charles Woodson. Here are some stats for those two defensive backs.

In 2012, Asomugha allowed a 120.6 passer rating – fifth worst in the NFL according to PFT. He was the 101st-best cornerback in football (12th-worst) overall according to that website. In 2011, he was the 88th-best cornerback (21st-worst) in football according to PFT.

Charles Woodson will turn 37 in October. He missed nine games last season due to injury. In 2011, he gave up four touchdowns, but he also intercepted seven passes.

Do you think Woodson and Asomugha would upgrade the 49ers’ secondary?

7:56 Aaron Wilson reports the Texans are close to signing Ed Reed for Wes Welker money.

8:13 What are your thoughts on Denard Robinson? Could he be a good NFL running back or punt returner? He’s about the same size as Chris Johnson. Could a good QB coach turn Robinson into a pistol zone-read QB? Could the 49ers be interested in him?

8:17 The Patriots just signed former Bills WR Donald Jones. Their third down offensive playmakers are now Rob Gronkowski, Aaron Hernandez, Danny Amendola, Donald Jones and Leon Washington. Not too shabby.

8:54 The Cardinals will release QB Kevin Kolb. Which team do you think will want to sign him?

10:42 I’m thinking about the Seahawks defense, and I have a question for you. What will be their nickel four-man front? I’m guessing Cliff Avril at RDE, Brandon Mebane at RDT, Michael Bennett at LDT and Bruce Irvin at LDE.

12:32 FS Louis Delmas just re-signed with the Lions on a two-year deal. If the 49ers want to sign a free safety, Charles Woodson and Michael Huff are still available.

12:40 230-pound Arkansas RB Knile Davis, who ran a 4.3 at the Scouting Combine, looked good catching passes today at his Pro Day according to Tony Pauline. Davis should be on the 49ers’ radar.

12:56 My favorite QB in the draft, Tyler Wilson, is throwing with accuracy at his Pro Day, and his deep ball is “solid,” according to Tony Pauline.

12:59 More from Pauline on Wilson: “Again, Tyler Wilson, on the money 59-yards downfield to Cobi Hamilton.”

1:04 Matt Shaughnessy just signed a one year deal with the Cardinals.

4:18 The Vikings signed Greg Jennings. They still need another wide receiver.

4:26 The Patriots just signed S Adrian Wilson. They’ve been one of the most active teams in free agency.

,