On prior's reconstruction, The master argument of diodorus contains an equivocation and so is invalid for one class of diodorean "propositions." but diodorus knew of such "propositions" and an argument in his treatment of motion can be used to bring them under the master argument's sway. Also, Despite the consensus of antiquity, The master argument does not commit diodorus to determinism, Although it commits him to non-Deterministic theses which can be easily misinterpreted as deterministic.