Looks like we are having trouble with words here
a neutral plane keeps going where it is pointed - if anything - a gust or input changes it's attitude or direction -it then keeps going that new way - subject to speed change from attitude. (Newton ,Wayne- 3rd law)
Ground tracking related to stability - that is a new one on me --I see no relationship
Maybe you do -I don't see why.
apparantly your ideas all relate to tracking as viewed from a fixed ground point. N/Y ?
That is what I see based on your post 18 - frankly I am lost in what you are trying to describe
but then I have been lost for a helluva long time