I think that Willis found the same principle that Figuera but in a more complicated and less efficient implementation: Figuera moved orderly (in unison) the field lines which cut the wires of the induced coil (flux cutting induction), Willis' design just distorted the magnetic fields not so orderly as Figuera did to get the same effect. This design shows that no recycling is needed to get OU. Just pick up the effect of the two confronted moving fields. Look this image below to see the big similarity to Figuera design:

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