He is in a class of his own.
Takes the 2nd best forward, wins one on ones zone off and rebounds better than any key defender .
I think the reason Champion Data are not responding to the way he plays is because they mainly rate key defenders by the number of spoils. After all key defenders are not meant to intercept, or even intercept mark, they are not supposed to win against key forwards, they are meant to spoil them.
That is partly why Hartley currently ranks 70 points higher than Hurls and has risen teadily through the season, while Hurls is just hovering at the same level.