This may help answer some of your question, though I recognize it does not address it directly:
https://www.youtube.com/watch?v=MBnnXbOM5S4 (3b1b on the Heisenberg uncertainty principle and how it arises)
Think of a free neutron as the wave envelope, rather than any of the bumps in the wave.
How do free neutrons, etc. work into this?
https://en.wikipedia.org/wiki/Free_neutron_decay