“We don’t know yet the reason why one of the guys went out,” said the official, who requested anonymity because the investigation was continuing. “But what is sure is that at the very end of the flight, the other pilot is alone and does not open the door.”
The above is a quote from the NYT article. It seems pretty definitive, so has anyone from the BEA or other official source denied the claim made by what was quoted as a "senior investigator"