Ngineer
"Obviously the aircraft had been towed, or did taxi onto gate. But are you saying that the tow commenced without gear pins fitted correctly, and the NLG collapsed with the tow bar and tractor connected during the tow? I see no evidence of this."
The AAIB are on the scene. It might be best to leave the investigation, analysis and explanation to them.
My comment was purely factual - the aircraft didn't taxi onto the gate, it was towed. As to whether or not that will turn out to be relevant to what happened subsequently, I'm not about to try and guess.