  Diquark models have been applied with varying degree of success to tetraquark
and pentaquark states involving both light and heavy quark degrees of freedom.
We discuss the applicability of such models to light quark dibaryons, viewed as
three-diquark objects. Highlighting the case of the d*(2380) dibaryon
resonance, we demonstrate the inapplicability of diquark models in the light
quark sector.
