There are many examples of Kinesia paradoxa shown on youtube videos. For example, the man from the Netherlands who could not walk but did quite well riding a bike or the American who could walk well on his hands but not his feet.

My theory is that Parkinson's acts like a slow moving "infection" in the brain. First it starts in one location and then moves on to other regions.

To me it only makes sense that Parkinson's starts to affect those parts of the brain that enable us to do the things that most humans can do without any thought, for example, walking. At the same time it has yet to affect those parts of the brain that require more mental effort such as biking, singing, dancing, or skating.

I don't think that the phenomenon of Kinesia paradoxa is explained by either the limbic system response or neuroplasticity.