Which leads back to the obvious question, why was the rudder ineffective in resisting the roll induced by the ailerons?
Initially at least, the rudder would have been held in a position that matched the roll input to provide a balanced turn. As the bank angle increased beyond what was expected, one must assume that the control yokes were turned to reduce the angle of bank and a corresponding reversal of rudder input should have been instinctive.
Were the pilots so confused by the sudden complete lack of aileron control that they forgot to use the rudder? Was there concern that a full deflection of the rudder might lead to loss of control or induce a spin at relatively low speed and altitude?
The Electra was a pretty complex aircraft for the era so I am led to wonder if there may have been an element of "what is it doing now?", in the pilot's minds. Basically getting behind in flying the aircraft during the emergency because of all of the possible things that could have gone wrong. This seems to be just as much, if not more of a problem in today's fly by wire aircraft, with totally serviceable aircraft being flown into the ground (or sea) because a relative minor incident caused the crew to lose focus and situational awareness.