Just watched a few of the videos and I think I've been able to answer my own question. He doesn't have a real passion for the game as he states in one of his videos. For that reason I don't think he will, or can become elite (on Tour) but I don't doubt that he can still get to expert level after a few more years of dedicated practice.

I think that passion part is key to becoming truly great. The passion drives the desire to practice, and practice well with large gains. During his time Hogan was known for practicing more than any other golfer, when he began to do really well on tour the other golfers started joining him so they could keep up. When asked how he was able to work so hard and practice so much he replied that he hard a hard time getting to sleep because he couldn't wait to get to the range in the morning to practice. Hogan was and still is known as the greatest ball striker ever.

Again, I believe that Talent = Passion + Time Spent. A component of passion is dedication and perseverance which he seems to have but there's something else that really drives it. Without it I think he's limited to what he can achieve.

Perhaps it's idealistic but I don't think anyone who lacks passion can hit like Hogan no matter how much time they spend. I'm sure they can become very good, but not like Hogan.

For the uninitiated, art: http://www.youtube.com/watch?v=z-Nw__K1myQ