In the early part of the 2010 season, Posey was already a good route runner.
His production would have been a whole lot better had he played on an offense like Okl. St. or Baylor.
He shows the ability to get seperation at the top of the route as he goes in and out of the break smoothly.
He can drive the CB downfield with good acceleration and then make a clean break to either side, or come back smoothly, leaving a big gap between him and the defender. (Deep-Ins, deep outs, comebackers, hitches.)
He has a good double move that he uses to his advantage on the corner, post and post-corner routes.
He runs an effective fade route in the red zone.
He leaves enough room along the side-line to help his QB; he can adjust his routes as he sees the throw or in instances where the QB was under pressure, and he knows when to play defensive football to prevent an INT.
In those first 6 games of the 2010 season, I did see him drop a ball; it was a short stop route where he was wide open; he just took his eyes off the ball looking to make a football move a bit too soon.
On a slant route, he didn't catch a "hot" ball ("too hot" was the term used by the commentator).
Again, he was wide-open; he probably expected the QB to take a little off the ball as there was no need to drive it.
He's a good college blocker.
He was instrumental in the 2 TD runs (and others) in the 3 games he played in 2011.
Yes, he does need to play until the whistle blow and he needs to actively engage his block better; but those are the things common at the collegiate level (heck, even in the pros - ie., all the Texans receivers and TEs in the early part of their career.)
I did see Posey engage in some heated battles with the CBs and safeties.
He will be fine.
I don't see the comparison with Gaffney in the middle in any of the 9 games I've watched so far; Posey can go inside.