Interesting stat, but I'd be interested in knowing what has happened on the right side, game by game, with Free playing, over the course of the season. It wold also be interesting to know how the opposing defense plays against the run in each of those games (YPC). For example, the Giants have allowed 4.9 YPC over the course of 15 games this season. That would suggest that they're pretty bad against the run on a fairly consistent basis.
It's really just easier to watch the games and focus on Free or Parnell. There were 4 runs to the right in the 2nd half of the 2nd Eagles game that were are killed by backside pursuit. The guys on the right were doing their job but the guys on the left side failed. On 2 of those plays Escobar was lined up next to Tyron and his man was able to beat him and get across the Cowboys backfield to make a tackle for zero gain or a loss despite the fact that the run was to the right (away from him).
Using statistics to judge the right side of the line on those plays would be misleading.
I've watched all of the snaps played by both Free and Parnell. That includes watching them on the broadcast (DVR) and both views of the coaches film.
The summary of my observations:
Power Run Blocking: Parnell is better. Parnell is much more powerful. Free can do OK if he can lean on a defender with his shoulder, but he has issues with upper body strength (hand/arm).
Pass Blocking: About equal. Parnell has not allowed a sack in 4 starts and his technique continues to look better with each game started.
Backside Zone Run Blocking (runs to the left): Free is better, but this is the area where Parnell improved the most from his 1st start to his 4th start. It's a finesse type of block that's more about timing than physical ability.
Front Side Zone Blocking (runs to the right): About equal.
Second level run blocking: Free is better, but we're talking about Free missing 0 to 1 second level blocks and Parnell missing 1 to 2 second level blocks per game.
Overall: Free has more experience. Parnell has better physical ability. It's very close at this point but we're comparing a guy (Parnell) that has 5 career starts to a guy (Free) that has about 80 career starts. Parnell's technique will improve but it's highly unlikely that Free will ever get stronger.