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Don't quite follow the question. Are you suggesting that the two scopes have to be perfectly aligned in order to get good guiding? In that case the answer is that the scopes don't have to be aligned at all. That's why guide rings work--you can move the guidescope around until you find a good guide star. Both scopes track whatever they are pointing at, so if you keep one accurately tracking an object, the other one will also track its object accurately, even if it is a different object.
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