Con-pilot, I think he was referring to the crew, not the victims. Unless threa Re criminal charged laid, I think they will be allowed to return home.
Okay, if that is the case, it didn't really read like that, but as far as I know, in the US criminal charges cannot be filed, if even then, in case of an accident until after the NTSB report comes out. So the flight crew can go home as soon as they are interviewed.
Now I could be wrong, as many years ago, there was an accident involving a Mexican crew, they left the US to go back to Mexico before they were even interviewed by the NTSB. So the law may have changed.
But, in any case, this crew on the 777 would have to be charged with a crime to keep them in the country and for criminal charges to be filed, there would have to be probable cause, from the accident report. Unless of course they have a blood/alcohol in excess of the limit. Which I do not believe is a factor here. But who knows.