Let's back up.
Okung is clearly his own problem, not Cable's. He's playing injured, playing jittery, and committing false starts and holding all over the place. That's not on Cable.
Unger is also oft-injured. It is fruitless to blame an OL coach for that sort of thing.
Britt is a rookie.
Moffitt was a miss, but it sounds like he wasn't motivated to play professional football, either.
James Carpenter and JR Sweezy have been huge success stories this year. Nobody's brought them up once this season, except in a positive way, because they're doing exactly what they're supposed to do. Even Sweezy's occasional whiff is down to a low enough frequency that nobody cares.
Zach Miller and Luke Willson are doing brilliantly in the blocking game. True, they're their own position with their own coach, but the blocking
scheme is Cable's.
Put all that together and I have a hard time faulting one guy. There are problems all over the place and there is no one magic bullet. I was hoping this board would have moved past the habit of looking for a single panacea and blaming one guy over results - but I guess that's optimistic.