The beginning of the video shows the C-130 in a slight descent which would be very unusual on takeoff. Then a snap roll to the left.
By nosing down the pilot may be attempting to maintain airspeed following engine failure. It could also be power failure on the left side but to induce that type of roll it would have to be both engines.
There is no way a pilot would command that kind of roll rate although the 130 is capable of it. That could have resulted from excessive rudder input or flap failure on the left side. So, it could well be an unfortunate mechanical issue.
I would be surprised if load shifting is an issue as some are speculating on this thread. There probably was a light load or no load since it was going to the boneyard.
In any case I mourn the loss of the 9 aircrew members and I grieve with their families and squadron mates.
I would agree, I did not know the details of the plane coming or going, what it was or wasn’t carrying, but in a plane of that age, mechanical failure could absolutely be an issue.
In a cargo plane, I always think load shift first, pilot error second, and mechanical third.
But no load rules out load shift.