Is a bird that cannot fly no longer a bird?
At the center of each shape lies the same immovable center.
Thanks for the discourse, perhaps training by other means could still be considered "in the spirit of Aikido." This was meant to emphasize the fact that there are many ways to achieve enlightenment. Not all manners would be considered Aikido, not everything can be labeled the same.
So, the "immovable center" is and at the same time may not be considered by the same name. True to your previous statements, one person may be doing Aikido and the other may not.
"Caminante, no hay camino. . . se hace camino al andar."