That's right, an Inquisitor Lord is an IC but only if his (mandatory) retinue is wiped out. Then he can join any other squad he feels the need to. Inquisitors are ICs and do not have mandatory retinues so they'd work for that. An IL with a retinue can't join another squad, the only army that lets multiple-model units join others is the Tau, w/ their drones.
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