Maybe the left aileron upfloat is due to damage the left aileron primary control cable. (The upfloat changes from the first few seconds, of the latest video, to the 20 second mark, where upfloat is at its maximum, and stays there until impact. An NTSB report regarding a possibly similar occurrence refers. See NTSB ERA11LA117. The left aileron, with what appears to be close to maximum deflection, would make turning to the right on base challenging. With a left engine most likely producing less power in the final minute or so, manoeuvring the aircraft would be difficult. To me the engine note changes, in the video from inside the aircraft, in an attempt to keep wings close to level close to the ground.