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Although I cannot help with most of what is being discussed, I can say with assuring that parallax definitely doesn't come into consideration!
As for two cameras guiding through the same scope, the only instance I can think of there being issues is if you have one guiding in the centre and the other guiding from a corner when the PA is off. Error here will be caused by one camera detecting rotation around the centre while the other is guiding on the centre.
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