My thinking would be this on Matieu, hence the late round gamble.
His short term contribution would be limited to the return game protecting us from Cobb being back there.
Long term, try and develop him as a complete player and gives us a option going forward if Williams performance slips more as his salary next season hits 9.5 million against the cap.
We don't need a corner today, but this option gives you a player of need in the special teams that may also help bridge a hole in the near future.
We have Shields, Hayward and possibly House beyond Williams.. that means we could have a depth need in 2014 to be filled.
To me.. this would be a gamble worth it in a later round. If he tanks.. so be it. But maybe we hit on it and have another player with great instincts.
I would not commit a 4th or less on him.. the risk / reward at that point just seems to great.
"The oranges are dry; the apples are mealy; and the papayas... I don't know what's going on with the papayas!"