I am sorry If I have not made myself clear. I repeat the DRDL is not in the business of making weapons. They are in the busness of designing and creating working weapons. Once the DRDL has finished its work, the army conducts extensive trials in the field and has to approve purchase of these weapons. Once this is done the OFB takes over sets up manufacturing lines, and starts production. There is no way the government can buy an essentially untested product, on the strength of some assurance by the DRDL, and send soldiers to the battlefield with these. To give you an example, the Akash missile is being tested for the past 20 years, and I know of atleast three user (Airforce) trials that have been done on it. Only now has the airforce committed to buy it. You might also know that the petty Sonia government foisted a case on George Fernandes for allowing the Navy to buy the Barak missile in 2000, and not giving much credence to the DRDO claim that it will have the Akash on time. We now know that the Akash is finally ready only now.
The CAG is essentially a bean counter. His job is to go through the records and point out to the goverment where money could have been saved. He does not have a holistic view of things, and certainly has no clue on how the Army and DRDO conduct their affairs.
