There are rumours that there exists a reign of terror in the Vatican. The sudden expulsion of three members of the CDF at the behest of the Pope without explanation to Müller save for to say, "I am the Pope." The side-lining of Cardinal Sarah of the CDW and the rebuke over orientation where he is still in charge but the personnel have been replaced. Also the rebuilding of the Institute John Paul II, loaded again with opponents of that Pope's vision and teaching.
Müller it would seem is on his way out. Is this his last stand to hang on to his job in the hope that an orthodox pope may be not far off? He has quietly supported the four Cardinals for more than a month. What has suddenly persuaded him to be 'amazed' at the publication of the dubia when he has guardedly supported the questions since they went public over a month ago? 
He is, alas, between a rock and a hard place, Francis has reduced this once most powerful defender of the faith to a mere sideshow.