Hi,
On why the PF's seatbelt may not have been fastened at impact, I believe Mr. Optimistic commented earlier that the PF may have been preparing to get out of his seat to let the captain in. I think this is a reasonable conclusion to draw at the moment - I can see something like that occurring, but of course there is no evidence thus far to support this suggestion.
I don't think this is a reasonable conclusion ....
The reasonable (and logic conclusion) was that the captain take place in the left seat (due to his qualifications and common usage)
It's certainly the first place to go who come to his mind if he want to take command
In the CVR report .. nothing (not a word) about captain to take command.
If this was the case .. sure the BEA had reporting the wordings .. as it is a important event ...