OK

ProFootballFocus graded Zach Strief as the 7th best tackle overall and the best right tackle in the league for the 2013 season. He ranked 7th out of 128 tackles graded. In 1062 snaps, he gave up 3 sacks, 4 hits and 26 hurries. They scored his run blocking as average -.1, his screen blocking as just below that -.5, but his pass blocking was exceptional at 21.7, third best in the league behind Joe Thomas and Trent Williams.

De la Puente graded slightly above average with a positive 4.0. He was ranked 16th out of the 64 centers graded. He had positive grades in pass blocking at 2.7 and screen blocking at 1.5. He received negative marks for run blocking, -3.7 and was one of the least penalized centers in the league.

As far as Brown goes, I can't help you, PFF gave him a pretty bad grade. His pass blocking was terrible, ranking 122 out of 128 tackles graded.