There has been a lot of speculation based upon individuals interpretations of FR24, ADS-B, door-bell videos and expert ear analysts such that moderators have had their work cut out sorting the wheat from the chaff.
A number of experienced helicopter pilots have hinted that this is best left to the NTSB. Since this thread is trawled by the media and others looking for, and getting, any misdirection available there will be a slash and burn policy on any more posts of this nature.
Stick to what you actually know, not what you think you know.