No. The large pin that hold the shoes in place only hold the shoes in place. The tiny pin only keeps the couple from falling off. Neither one restricts the action of the coupler itself. You're thinking to hard about it.
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Agreed, there are 3 pins used here. The big roll pin holds the coupler to the input shaft of the steering gear. The tiny roll pin helps keep the internal guts of the coupler from just falling out. The last pin is the main one that takes a press to install it in the lower end of the center shaft. It is the pivot point for the shoes inside the coupler. None of these pins keep the coupler from sliding or pivoting.