  Studies of Feshbach resonance phenomena in fermionic alkali gases have drawn
heavily on the intuition afforded by a Fermi-Bose theory which presents the
Feshbach molecule as a featureless Bose particle. While this model may provide
a suitable platform to explore the lithium-6 system, we argue that its
application to potassium-40, where the hyperfine structure is inverted, is
inappropriate. Introducing a three-state Fermi model, where a spin state is
shared by the open and closed channel states, we show that effects of ``Pauli
blocking'' are recorded in the internal structure of the condensate wave
function.
