If Mahony actually did what then Cardinal Ratzinger suggested, it would mark a truly historical moment. It would be an absolute first. He's made a career out of ignoring Vatican directives and suggestions.
They can't have it both ways.
They can't cultivate a liberal American Church which flouts Vatican directives and makes its own rules and then throw up their hands in innocence and say "I was only following orders" when things go wrong and the chickens come home to roost.