Sorry for taking some time to reply to this thread.

As Jim says, this does seem to be a semantic minefield. But I suspect
that were people face-to-face they could hammer out their differences
fairly quickly. It is often the way on Usenet.

My take on the contentious issues is as follows.

The idler motor will generate a voltage at the third terminal when not
connected to a load, but it cannot supply any generated power because no
current can be drawn. The difference here is between generated voltage
and generated power.

I would say that the RPC idler and load motors are in parallel in a
topological sense. However, the current flow within the windings of the
motors will be very different from what would be seen if the two motors
were connected in parallel across a three phase supply. I suspect that
this is the root of the disagreement here.

All are fair points.

Chris