My conclusion is that the evidence is good, but not strong enough.
There is a major flaw with your evidence which I thought of after I made my last post.
Every year, the crop circles which are made up to the month of May are man-made (i.e. will require the access to footpaths) and any crop circles after that are not made by humans.
There is no way that your evidence will be able to falsify this claim. That is why you will require that the rights of way be closed until the end of the year to at least counter the above statement.