In my view, Export benefits like DBK and other export incentives under FTP are predominantly to the account of Merchant exporter only since he is the ultimate exporter and will be receiving the foreign exchange for that export where he pays the agreed price in INR to the supplier in India.
However, with regard to Rebate of duty iof any paid on the consignment by the manufacturer supplier at the time of clearance from factory, such rebate can be claimed predominantly by the manufacturer supplier and if the supplier gives a disclaimer certificate then the merchant exporter can claim the rebate.
Best Regards
Surya