Crab,
You did read the account where a Helicopter Mechanic observed the Aircraft come apart in the air? His comment did not mention any unusual maneuver.
At this time, although you are factually correct, I would suggest speculating on any cause is premature.
Can we just accept the fact there was a tragic event that took the lives of two Pilots and it shall be investigated and reported upon.
As accurate and relevant information is released....then folks can start the "Speculation Game" but at least it can be based upon something of substance.