That theory would be plausible if the fact that the plane did the westerly turn 12 minutes BEFORE the last radio contact with the plane where the co-pilot said “Alright good night” unless the pilots were psychics and saw this supposed fire coming in a premonition this theory does not make sense..now if the turn was made AFTER the last radio contact I might be willing to believe the smoke in the cockpit theory
You probably know more about this than I.