PFF's stats differ from the ones you have posted but Barclay (73rd out of 74 offensive tackles) and Bakhtiari (67th) are on the bottom of their pass blocking efficiency rankings.
I've observed several times before that beyond pressures Bakhtiari has been penalty-prone in past seasons. So far this season, he's had 5 penalties...3 holding and 2 false starts, all accepted by the opponent. While penalties might not be included in pressures, I'd assume PFF takes them into account.
5 penalties in 4 games is a lot...he's tied for 2nd. in the league among O-Linemen, with Ducasse leading with 6 with one declined; Bakhtiari is tied for 1st. in accepted penalties.
http://www.nflpenalties.com/all-players.php?year=2015
The three 10-yarders in particular were potential drive killers.
One good thing we can say about Barclay is that he has yet to be penalized:
http://www.footballdb.com/stats/penalties-player.html?yr=2015&tm=12
Here are the details of Bakhtiari's penalties:
- 3rd. and 3
false start resulting in 3rd. and 8
series result: first down
- 2nd. and 7
holding resulting in 2rd. and 17
series result: field goal
- 2nd. and 10
false start resulting in 2nd. and 15
series result: first down
- 2nd. and 8
holding resulting in 2nd. and 18
series result: first down
- 2nd. and 7
holding resulting in 2nd. and 17
series result: first down
So far, Rodgers has bailed out Bakhtiari 4 out of 5 times with first down passes, so the damage has been neutralized. Nonetheless, excluding end of half/game kneel-downs, the Packers have had 39 possessions in 4 games with Bakhtiari putting 13% of those possessions in jeopardy.
Packer opponents to this point are currently ranked 31st., 21st., 27th. and 29th. in passer rating against. Expecting Rodgers to bail out these kinds of penalties with regularity against more robust pass defenses is not something to be counted on.