I fail to see any logic in that argument. This guy ran a background check at another FFL for the 2nd transfer. He was the buyer until he legally sold it to another at an FFL. Were throwing one of our own under the bus here.
Except that he wasn't. Go back and read the order of events. He was buying on behalf of his uncle the entire time. He prearranged the sale. He was paid by his uncle for the sale before he made the purchase. He then made the purchase after everything had been prearranged and transferred the weapon. At the time he made the purchase he had no intention of being the owner of the weapon at any point in time.