One of the things we don't like to remember on Niners Nation is releasing Marcus Cooper. If you read the comments section of a lot articles about cornerback's or the draft he's pretty much always mentioned. I just wanted to post a quick recap of his PFF #'s for the year (I recently bit the bullet and paid for the subscription and he was one of the first players I looked up). PFF #'s aren't the end of all statistics, but they are at least a reference point.
Cooper ended the year with a - 3.8 overall grade, with a -1.3 coverage in run defense and -5.6 in coverage. Opposing QB's had a 89.3 rating while targeting him. He rated 63/81st for cover snaps per reception with 9.1.
He performed like an average cornerback during his first three games, though he only played a total of 14 snaps. He had three very good games against the New York Giants (then 0-4), against Oakland (where Terelle Pryror was sacked 10 times), and the Cleveland Browns (vs Jason Campbell's starting game as QB, though Campbell did have a 105.4 QB rating that game). Throughout the rest of the season he performed very poorly. Peyton Manning annihilated him in week 11 with a -5.8 grade, and again in week 13 with a -3.9 grade. Rivers also torched him in week 12, where he received a -3.3 overall and a -3.7 in coverage, despite his interception.
Here's the links to two of his three interceptions of the season. I couldn't find the video of his interception against San Diego. If anyone could find it I'd be curious and appreciative.
1) vs Peyton Manning : http://www.nfl.com/videos/nfl-game-highlights/0ap2000000290802/Peyton-Manning-throws-2nd-interception
As you can see, Marcus Cooper is in front of Eric Decker for a high, under thrown ball. This is a rare choice where Peyton made A) a bad decision to throw the ball to Decker and B) Manning actually threw a terrible ball. Yes, believe it or not, it is possible.
2) vs Terelle Pryor : http://www.nfl.com/videos/nfl-game-highlights/0ap2000000261435/Pryor-throws-fourth-quarter-interception
I'll give credit to Cooper here for having what we as humans call eyes. He moved to catch the ball, but for the most part Pryror practically threw this ball straight to him.
I'll let you draw your conclusions from here based on this.