Why stop at just one AD?
At any given time every fleet type has multiple Ad's (emergency or not) that are waiting to be complied, These are all part of the match of postulations for and against that the investigation considers.
To be worthy of a discussion point as postulation you would at least have some factual Pros to connect a series of dots pointing at such an AD as worthy of being considered.
So did a passing ship report seeing an engine come off and fall into the water?
Is one engine widely separated from the aircraft?
Just having a weak bolt is insignificant to the engine to pylon to wing load path unless a massive engine failure occurred leading to a significant challenge to this load.
I haven't seen one shred of evidence supporting this uniquely suggested AD and expect that somebody is just shopping unsupported speculation