The tail rotor blade failure sometimes colloquially called “blade collapse” could be another crash initiating event. The metallic pitch horn / snubber housing can disbond from the tail blade skins and cause progressive failure as the blade trailing edge unzips, allowing the horn to migrate further outboard, which unzips the skins further and eventually the blade is largely destroyed. Sometimes the horn migrating outboard keeps the tail rotor 1P somewhat in a tolerable zone and the consequence is a loss of tail rotor authority. Sometimes the tail rotor 1P is more severe and the TR gearbox and rotor assy leaves the aircraft.
Hopefully the investigators determine the actual cause instead of us keyboard engineers yammering at each other.