Bears left tackle J'Marcus Webb not among worst pass protectors?

According to a new article Chicago Bears starting left tackle J'Marcus Webb is not among the worst pass protectors in the NFL.  According to a three year study by ProFootballFocus, Webb does not make the list of worst in the NFL.

The list rates the 15 worst offensive tackles in the NFL over a three year period.  Curiously Webb is left off the list, providing hope that perhaps Webb is not as bad as initially thought.

In order to qualify for PFF's list, a player has to have taken a minimum of 1,000 pass protection snaps during the last three seasons.  According to single year pass protection lists, Webb would qualify for the list.

Although Webb has only been in the NFL for two seasons, that would not seem to disqualify him for making the list of worst pass protectors on the list.  Anthony Davis of the 49ers made the list, and he was drafted in 2010, same year as Webb.

While Webb has made the list of worst pass protectors in the NFL by PFF ratings in 2010 and 2011, he's absent from the overall three year list.

According to PFF's two year total for Webb, he's spent 1,080 snaps in pass protection during his first two years in the NFL.

As a RT in 2010 Webb ranked as the worst in the NFL in pass protection posting a pass protection efficiency rating of 9.18.

The question now becomes is Webb missing by mistake, or is he missing because he legitimately is not among the worst 15 pass protectors in the NFL?

Update, the question has been answered, Webb failed to make the list because he was just short of the 1,000 snaps needed to qualify.  When we subtract out Webb's non-nullified plays (penalties etc.)  Webb has 966 pass protection snaps in two years in the NFL.  Webb is still the worst pass protector in the NFL by PFF's rankings. 

From an email from Khaled Elsayed author of the article and analyst on PFF regarding Webb's omission from the article: 

He missed out because he didn’t play more than 1,000 snaps in pass protection on non-nullified plays. The numbers of Webb on the Bears team page include plays where penalties were accepted and thus statistics like hits, sacks and hurries can’t be called. Eliminating those plays he was up at 966 pass blocks; so short of what was required to make the list.

Now if he had played enough snaps he would have finished with the lowest rating of any of the guys. His number was at 91.8, so really poor. More shocking news for the Bears fans out there, Frank Omiyale was actually worse in his 663 pass blocks; 91.7. Only two players who were in pass pro for more than 500 snaps had worse ratings (Brandyn Dombrowski at 89.73 on 560 snaps, and Guy Whimper at 90.7 on 527).

So over 600 snaps the Bears had the worst two performers (and Chris Williams stint at tackle earned him a 93.13 grade which was marginally better than Sam Baker).