Jon has a legitimate point, though.
There are a lot of myths and fud being propagated on this and a lot of this is indeed semantics.
KG played 1/3 of his minutes at PF last year. But even when lined up at C, the only thing that meant on defense was that he was the primary on the other team's C for man defense. He still continued to cheat to the high paint, which is where his highest defensive value was. And whenever it was possible to put our other big on the post player (i.e., when Bass was not clearly too short or whenever we had Stiemsma or Hollins in with KG), KG shifted to out-right PF on defense.
Playing the zone also negates some of this distinction as well.
Offensively, we have often had KG at the '5' in our small, 'Posey' configuration so that was not really anything new.
The net point, though, is that Doc had KG play more at the 5 this year NOT because he was better at that than playing the 4. He had KG playing the 5 because JO & Wilcox went down and his next best big man on the depth chart, Brandon Bass, was too short to play the 5. It's really as simple as that.
Some of our _best_ performing 5-man units last year had KG at the 4, along side GS at the 5. Unfortunately, Greg's foot injury really impaired his ability to supply minutes in the playoffs.