I see no reason why you cant be good at both Run and Pass blocking.
I see much better blocking on other teams. We have very talented players in Bulaga and Sitton. We have an above average player in Lang. Saturday is a notch below average and sinking. Newhouse is below but rising.
As far as folks comparing to top rush and pass offenses; there are too many factors there including RB, QB capabilities. But regardless, I don't need the Pack to be in the top 5 to consider them successful rushing the ball. Remember, that the Pack has the advantage of lots of good WRs and HOF QB. Most teams are protecting against the pass and should be easier to run on. I would be happy with the middle of the pack somewhere. What I see is an OL that doesn't seem to be able to open up holes in the run game. That can be 2 things, 1. The OL players are incapable or 2. The offensive plays are poorly designed. I believe it to be #1. Then I have to look at the players or the coach. As I stated above, I do believe there is talent on the OL, so it comes down to coaching.
IMHO, any talk of ZBS is misplaced. The Packers, even at the height, only ran it 60%ish of the time. I wonder how much they still use it. Whenever I specifically watch for it, I don't see it very often. Granted, they may be so bad you can't even recognize it . . .
As far as the OP and hiring a new guy - I only criticize you for saying we should wait to the end of the season. I would do it now. I think it would send a great message to the OL, hey your performance cost a man his job. That could be extra motivation. Besides, if there is a real good coach out there, why wait for another team to hire him when we would have to wait till our season ends in February?