The key observation that allows us to resolve the tension between trusting the initialization and enforcing one DEO per NPI context is that the distributions of words that co-occur with DEOs and piggybackers are different, and that this difference follows from Ladusaw's hypothesis.
while DEOs may appear with or without piggybackers in NPI contexts, piggybackers do not appear without DEOs in NPI contexts, because Ladusaw's hypothesis stipulates that a DEO is required to license the NPI in the first place.