I did some considerable web crawling on this and I have Adire's engineer saying explicity that the technique allows you to double the driver Qts, going from 0.38 with both coils driven to 0.76 with one coil driven and one coil shorted with the appropriate resistance.

There just doesn't seem to be any way that's possible given the derivation I found, which looks pretty consistent to me (but dynamics was never my long suit).

• Derivation