I'll make you my personal speed bag yet again.
Getzlaf vs Panik, Getzlaf outweighed him by 10 pounds and had 3 inches on him. Draw.
Getzlaf vs Shore, Getzlaf outweighed him by 35 pounds and had 4 inches on him. Getzlaf won.
Getzlaf vs Schenn, Getzlaf had 2 inches on him, both weighed the same. Getzlaf Lost.
Getzlaf vs Wideman, Getzlaf outweighed him by 15 pounds and had 4 inches on him. Getzlaf Won.
Getzlaf vs Hainsey, Getzlaf outweighed him by 10 pounds and had an inch on him. Getzlaf Lost.
Getzlaf vs Burrows, Getzlaf outweighed him by 30 pounds and had 3 inches on him. Getzlaf Won.
Getzlaf vs Downie, Getzlaf outweighed him by 28 pounds and had 5 inches on him. Draw.
Getzlaf vs Downie, Getzlaf outweighed him by 28 pounds and had 5 inches on him. Getzlaf Won.
Getzlaf vs Ericsson, Getzlaf was outweighed by 2 pounds and gave up 1 inch. Draw.
Getzlaf vs Barker, Getzlaf and Barker were the same weight, Getzlaf had an inch on him. Draw.
Getzlaf vs Weber, Getzlaf outweighed him by 5 pounds and had 1 inch on him. Getzlaf Lost.
Getzlaf vs Bass, Getzlaf outweighed him by 15 pounds and had 3 inches on him. Draw.
Getzlaf vs Duco, Getzlaf outweighed him by 17 pounds and had 6 inches on him. Getzlaf Won.
Getzlaf vs Fisher, Getzlaf outweighed him by 5 pounds and had 3 inches on him. Draw.
Getzlaf vs McCormick, Getzlaf had 1 inch on him, but was outweighed by 3 pounds. Getzlaf Lost.
Getzlaf vs Tyutin, both weighed the same, Getzlaf was taller by 2 inches. Getzlaf Won.
Getzlaf vs Simmonds, Getzlaf outweighed him by 35 pounds, and had 2 inches on him. Getzlaf Lost.
Getzlaf vs Guerin, both guys weighed the same, Getzlaf had 2 inches on him. Draw.
Getzlaf vs Malhotra, Getzlaf outweighed him by a few pounds, and had 2 inches on him. Draw.
Getzlaf vs Thornton, both were the same height, Thornton outweighed him by 15 pounds. Getzlaf Lost.
Getzlaf vs Pettinger, Getzlaf outweighed him by 15 pounds and had 3 inches on him. Draw.
Getzlaf vs Kesler, Getzlaf outweighed him by 10 pounds and had 2 inches on him. Getzlaf Won.
Getzlaf vs Laperriere, Getzlaf outweighed him by 18 pounds and had 3 inches on him. Getzlaf Lost.
Getzlaf vs Pratt, both were pretty much the same weight, Getzlaf had 1 inch on him. Draw.
Getzlaf vs Schultz, Getzlaf outweighed him by 31 pounds and had 4 inches on him. Getzlaf Won.
Getzlaf vs Burrows, Getzlaf outweighed him by 30 pounds and had 3 inches on him. Getzlaf Won.
Getzlaf vs Fisher, Getzlaf outweighed him by 5 pounds and had 3 inches on him. Draw.
Getzlaf vs Richmond, Getzlaf outweighed him by 25 pounds and had 4 inches on him. Draw.
Getzlaf vs Halpern, Getzlaf outweighed him by 15 pounds and had 4 inches. Getzlaf Won.
This is going back to the 2006-2007 season. So yeah, the bolded is when Getzlaf was undersized in a fight (and even then... not that badly). Looks to me like he's had his fair share of advantages.