bubbers
One has to admire your tenacity in defending your colleagues, but I fear you are now clutching at straws. As has been said several times both pedal position and rudder deflection were recorded and reported. This is an extract from the Performance Group's appendix to the NTSB report - sorry I don't seem to be able to make it smaller.
Bearing in mind the qualifications described in that report (different sampling times, yaw damper influence etc.) by any reasonable judgement the rudder deflection followed the pedal inputs. No system malfunction here!