It seems to me that 10,000 hours of practice may get this guy to a level of scratch, yet it still isn't guaranteed. But, if he doesn't have that certain something, he will never get to a serious professional competitive ability on a Nationwide, Euro, Australasian tour, let along our big show PGA.
If within the first 2000-3000 hours he doesn't show some flashes where he can shoot 70-74 every 10 or so outtings, and make 4 or more birdies in rounds on a serious golf design, he is never going to make it in the next 8000 hours. If he can't frequently have less than 30 putts per round, no matter what his other scores are in that first 2000-3000 hours, practice or play, he isn't going to ever make it, IMHO.
I think the fellow that may have the best insight on this is Mr Burke, on first page.
http://www.southlandgolfmagazine.com/t-People_Pat_Burke_Former_PGA_Tour_Pro_Golf_Instruction_Get_A_Grip_Foundation1009.aspx If I'm not mistaken, Pat is a pro I once watched on the practice range for an hour or more, and marveled at his graceful swing. If he is the pro that had long brown hair in a ponytail, (I think it was the year Tiger was at the Milwaukee Open at Brown Deer in the 'Hello World' event) Pat was on the range for hours practicing, and if I'm not mistaken, didn't even make the cut! But, he was practicing none the less, and was clearly one of the most watchable swings I'd ever seen, and stood out compared to other pros hitting balls right next to him! Am I correct on that Pat, was that you? For what it is worth, I'd love to have a swing like that, and wouldn't even care if I was making big tour money.
But there are examples both ways of guys that do put in incredible time in their sport and will and work themselves to highest levels, and guys that put in the time and can't make it that extra way, and guys that don't seem to put in that much time and still play at high levels. Can you say, Bruce Lietzky?