You could modify the PO print routine to show the requestor. Or you could copy the requestor name to the Notes to Supplier field, which should already print (you could have the requestor do it, or use a personalization or workflow to do it)
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Don't forget sometimes there is not a 1 REQ to 1 PO relationship.
Consider if many requisitions with different requestors and these requisitions are turned into a PO - what will happen then with those.
you also have the Destination Organization & Location field on po shipment where you have to delivers the goods.