As Chris indicated, I believe autonomy (or rather, autonomous) is a form of power. In particular, it is a form of power expressed with a freedom from control; a power independent of external influence. So in answer to your question, no, I am not confusing power with autonomy. More precisely, I would say autonomy is just a type of power.
Exactly so. The distinction matters. I think it's clear that some are failing to make that distinction in this discussion. Whether one fails to grasp that distinction or willfully ignores it, it still enables one to assert that those who are not seeking "power" in their aikido training are either 1)in denial or 2)incapable of exercising autonomy. That's the problem with using language as a blunt instrument: you tend to be wrong more often than not.