Caste Hindus could flood reserved-seat elections by diverting surplus votes to their Untouchable nominees

Evidence

Their main object was to flood the election to the seat reserved for the Untouchables in the joint electorate by using the surplus votes of the Hindus in favour of the Untouchable candidate who happens to be their nominee. The object was to outnumber the Untouchable voters and prevent them from electing their own nominee. This cannot be done unless the surplus votes of the Hindu voters were diverted from the Hindu candidate towards the Untouchable candidates. There is a greater chance of the diversion of these surplus votes under the distributive system than there is under the cumulative system. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 1315