How do you prove what the code book doesn't say. If it doesn't say it you can do it. It should be on him to tell you what it says you can't.
The only thing I'd mention is cable securing. With the walls open, you can secure it and it needs to be within 12" on an old work box with clamps. After you close the wall you may be fishing the cable so it doesn't have to be secured. Maybe he wants it properly secured and you can do that when the wall is open. I guess you could always come back after the rough and fish it into place legally.
Seems like the best thing is to ask an inspector how you are supposed to do it when there are still unknowns on the job.
The only thing I'd mention is cable securing. With the walls open, you can secure it and it needs to be within 12" on an old work box with clamps. After you close the wall you may be fishing the cable so it doesn't have to be secured. Maybe he wants it properly secured and you can do that when the wall is open. I guess you could always come back after the rough and fish it into place legally.
Seems like the best thing is to ask an inspector how you are supposed to do it when there are still unknowns on the job.