"a) Use of the word "overturn" does not imply legality (nor illegality). It does imply the will to "overturn" though."

When lawyers are using the term "overturn" they are talking about a legal process. Period. End of story.
That is what the term means.
When lawyers are using this term this does not suggests any illegal activity is involved.

In other words, your statement above is wrong.

Do you understand that there is such a thing as nomenclature and that in say the subject of Physics or in this case, Law, words have unique and specific meanings?

And a dictionary that says a thing like:

Law. To invalidate or reverse [a decision] by legal means.

Is referring to the definition of overturn as it's used by lawyers and the Law in general. In the nomenclature of Law there is an exact and sole meaning to that word.
And things like, "sort of like", "reminds me of", or "let me get my thesaurus", belongs in Poetry- not the Law.