To gleen more significant information those pilots and PAX who died would need to be categorised between:
1. The bodies never found,
2. The bodies found in the aircraft,
3. The bodies found outside the aircraft.
A significant number of 1 may have vacated the aircraft as did all of 3.
Most of the time life jackets are useless in our climate. You need a life raft and some say better still a dry suite.