Whew, that's a lot of references, Tim! Fortunately, the decisive point to answer the question, "to which bases do the runners return," is given in rule 2, the definition of 'interference':
Quote:
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... In the event the batter runner has not reached first base, all runners shall return to the base last occupied at the time of the pitch.
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Since BR is out on the interference, other runners return to their TOP base, even if their TOI base is different.