What caused Delta Flight 4819 to roll over during the crash landing in Toronto?

According to NBC News aviation analyst John Cox, the detachment of the right wing from the aircraft was the critical factor that caused the plane to roll over. The cockpit video, captured from another plane, reveals this crucial moment when the right wing separated from the aircraft upon impact with the runway. This video evidence clearly shows how the loss of the wing's stability directly led to the aircraft's roll, despite which all 80 passengers survived the dramatic incident with only 21 requiring hospital treatment.