Flying Debris
The aerial view of the crash site shows what appears to be roof damage in all directions (blue tarps) indicating a high energy near vertical impact.
The purpose of discussion of accidents serves to narrow the initial realm of posible causes and serves to focus the discussion.
When I was going through the training command we were killingh on average 1 person per week and we avidly read the CNATRA weekly accident report to better understand the numerous ways you can have a bad day.
I think FDR is probably pretty close to the truth with his thoughts on bird strikes. If proven, perhaps some reinforcement of the canopy or other structure would be warranted.