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I think its a small difference that seperates great fielder from poor ones. The good ones are that much better at reading a ball, getting a jump, and going straight to the ball. I'm sure positioning is a big part of it as well.
Many CFs have to look at ball throughout its flight. Guti works so hard at developing his instincts that he can take his eyes off the ball, run to a spot, and start tracking it again.