Nishant,
It's an interesting point though.
DOS are essentially now completely at the mercy of USCIS to come through with the extra approvals in August/September.
If they don't, visas can be wasted, since there appears to be no outlet in EB3 to consume them, based on the EB3 CODs set in the September VB.
It is possible that EB2-IC could take up some of the slack, since their is the possibility that the August VB movement was more than the numbers available now can support.
I seriously doubt CO would allow a situation where there is any chance of numbers being wasted.
If USCIS came through with 12k EB1 & EB2-ROW approvals in August/September, I think DOS would run out of visas.
In that scenario, I think they would honor any EB2-IC approvals and say that visas had become unavailable to EB1 & EB2-ROW. We would see a bumper number of approvals in October.