Personally I doubt a gear problem and professionals don't just stall the aircraft on takeoff. If the load shifted aft following rotate, the gear would be the last thing on the pilots mind. He would be pushing hard to avoid the stall and attempting to stay straight with rudder. The aicraft's direction keeps changing with rudder, but I don't think they controlled the pitch at all after the right wing dropped. The horizontal stab helps lower the nose during the fall, but by then they were essentially vertical with little or no forward airspeed for the elevators to have any effect.
So does the departure procedure at Bagram call for an early left turn or is that the first stall-induced wing drop (followed by a boot full of right rudder)? I'll be surprised if this isn't a load shift case given the rate of deceleration to zero forward airspeed. The aircraft just keeps pitching up until it falls.