I think the AA judges have a lot to answer for since Enright has about 200 All Australians and Burgoyne has 1, even though I'd take Burgone if I had to pick one of them.
It's not hard to grasp. Enright made 2 AA teams playing as a defensive midfielder, then another 4 playing as a pure half-back flanker. He was clearly the best player in both positions every time he was picked. And may be the best ever in the latter role.
Burgoyne has had one of the most undefined roles in the game since he came to Hawthorn. He's a gun, but being versatile makes it hard to mount an argument that 'he's more deserving of a midfield role than this bloke/more deserving of a defenders role than this bloke' etc etc.