The distinction is that players normally either wait a year before unretiring and/or wouldn't have been under contract when they came back. That, my friend, is the distinction that would be looked at if it went to court. For all intents and purposes he hasn't really retired. I'm very sure a court would find that a verbal condition would be that he actually retired. He hasn't physically retired.
I doubt the AFL has made their final decision and the AFL decision isn't a proper court decision.
As I said a number of times, Brisbane were sloppy in their execution. If they didn't want him to come out of retirement and play for another team within 12 months, then put it into the severance contract. It's a standard clause across most industries, and one which I'm sure the courts would look at. It's hardly a loophole, it's incompetence on Brisbane's behalf.