Oh B.S. If he is quoting someone else, he has no "property right" in the idea whatsoever.
And you have the whole thing backwards because, again you are confusing intellectual property and scholarship.
I quote a secondary source because I am attributing an idea to him or because he is the best source of information I have because the primary source is unavailable. If I am writing about the theory of relativity I cite Einstein rather than the 123rd expository textbook on the subject. Now it may be that someone discovered a unique application to a particular problem in astrophyics. Well, then I cite that paper. If I learned generally about a subject from a secondary source I will put it in my bibliography, particularly if it would be useful to the reader for additional information. But the secondary source has no primacy where the primary source is available.
Otherwise, you cannot write anything at all. I use the word "is" and I have to cite Bill Clinton.
Reminds me when a neighbor’s kids was writing an essay, he ask, “Do I need to give a citation when I say, “George Washington was our first president?”