Excuse me butting in, but my answers, JP would be:
1 The icing clearance of the aircraft precluded planned flight in IMC
2 The plan was always to complete a VFR transit, and it has been agreed by all that the weather was suitable for this.
3 I am confident that this was not a case of suicide and mass murder.
Soo no-one knows beyond all doubt why the aircraft ended up crashing in cloud.
No-one.