As i said way back at the start The AAIB will be quick to release any findings especially if this is not a one off so lets leave it to the proffessional investigation team
What i would say in regards to some suggestions is that i am up here working and the Clutha has 3 timber roofs made up of original first floor with substantial beams soundproofing secondary roof and further roof over that
It was a converted 3 floor tennament building with metre thick walls
This may well explain the delayed penetration after the initial very hard impact through the main roof structure
There is no way a 3 ton heli would penetrate the structure by 1 G alone