For Jayasingh (1980), this hypothesis seems to explain most of the anomalies pointed out earlier and also gives a logical explanation of how aculeate differentially invest in male and female progeny.
For them, it is probable that the small size and external method of feeding displayed by Melittobia as well as the fact that it can operate as a hyperparasites have eliminated most of its potential competitors for food in Jamaica, although both Melittobia and chrysidid wasps attack Aculeate in the U.S.A (Krombein, 1967) and in Trinidad (Taffe, 1979).