Seems to me that someone tried this out in court, and won. The 4473 does say "actual purchaser" but it doesn't define how long you have to own said firearm before you sell it.
If I remember correctly, they determined that legally, a person could stand at a gun shop counter and purchase a gun and then literally turn around and sell it to his buddy behind him, as a private transaction.
I don't have to worry about it. All of my siblings are old enough to buy their own guns.
Yeah, we're splitting hairs to some extent but that's exactly what a zealous DA would do if s/he thought they could prove intent. Realistically, if someone did buy a gun knowing they were going to turn around and sell it later, someone would have to blab, in all likelihood, before someone would get caught.