It's a subscriber only article. It's pretty interesting if you get a chance to read it.
Basically what it says is:
His college stance was too closed and resulted in a lot of metal bat opposite field jam singles. This resulted in a high batting average but a poor projection by scouts for wood bats.
Giant's opened up his stance which gives him better weight transfer and hand load and also allows him to see the ball better.
He attributes his strike zone knowledge to his time as a pitcher.
San Jose's manager Steve Decker thinks he could be a guy who hits for high average in the majors with a lot of doubles (he says 40) and about 15-20 homers and J.T. Snow like defense.