There is a common denominator you seem to be discounting.
They all said some missile-like object struck the plane.
Now it's your turn.
Show me evidence of a single spontaneously combusting jet fuel tank, other than TWA Flight 800.
Put up or shut up.
Actually, exactly none of them said that. Perhaps TWA 800 conspiracy theorists would be more successful if they didn't insist on making things up to support their theories.