It is not ignorant to be skeptical. Occasionally damage can occur on the ground prior to take off. Once in a while, a truck will damage an airframe, once in a while an aircraft will impact a tug, or food truck. Extremely rarely such damage goes unnoticed, and can affect flight.
“Both flaps at takeoff setting” is interesting. The term “both flaps” is also interesting. Here, the report takes into account the possibility that flaps may have not been set symmetrically. Hence “both flaps”. In your confidence, you have assumed what you consider to be complete knowledge. You missed that. You also missed the possibility of damage to the flap, likely impossible to ascertain post crash. Lockheed did not miss it. They spent time and not insignificant cash to exonerate fouled aileron.
I think I am within plausibility. My comments, though suggesting rarity, are not ignorant, because they do not suggest impossibility. IMO.
Last edited by Concours77; 28th Dec 2017 at 17:12.