It simply doesn't work that way. For example, I am related to every single member of the Swedish nobility of C16. All of them seemed to have had concubines. Take King John III of Sweden (who of course, is a distant cousin). He had a concubine called Karin Hansdottir, with whom he had three illegitimate children who survived infancy. He was unable to marry her, as she was not of the nobility. His brother, Erik XIV likewise had three illegitimate daughters with Agda Persdottir (a commoner). Like King Gustav (Erik and John's father) they could only marry other nobles (or lose their own nobility or royalty). They also need to have a male heir-apparent. So they paid off their mistresses. Agda got a castle in Kalmar and arranged marriage to one of Erik's courtiers. Karin likewise, was given some grand estates by John (when he dumped her to marry Princess Katarina Jagonellica) and an arranged marriage with first his chamberlain who sadly got executed, and then the castellan of one of his castles.
Rogue King Erik XIV did get his way and married a commoner who became Queen Consort (if only for two months before Erik was deposed) Karina Månsdottir, whose father was a tavern keeper. Erik is a cousin (less so than John III who was a full-blooded Leijonhufvud/Lowenhaupt) despite having a mother from Saxony. I show zero relationship to Karina Månsdottir, although I am related to her children because of Erik, and because she later married a Tott (noble)
I am a cousin (11th) of Karin Hansdotter, but not at all to the two men she was married to after being pensioned off by John. The second one, Lars Hordeel, was ennobled afer their marriage. He was made a knight (Boije) being a rare case of a commoner given this honour. He became a district judge of an entire region. I am not related to him at all (apart from by marriage). Karin was the illegitimate daughter of a noble woman named Ingeborg Tott (which explains her being a cousin).
I have zilch relationship to Agda Persdottir, but I do to her children with Erik and also her children with her arranged husband, a Swedish nobleman named Fleming.
My relationship to John III and Charles IX (brothers) is stronger than that of Erik's (different mother). This is because King Gustav (Vasa) was a minor noble from a couple of generations prior and married into the powerful Stures and Leijonhufvuds. The stronger relationship comes with John and Charles because the Leijonhufvuds are an ancient noble Swedish family, which of course, I am connected to, and less so to the Saxony bunch (Erik's maternal nobility).
This was C16. Now here is the thing. If I am a cousin or whatever of the aforementioned Swedish nobles and royals and this has happened purely because everybody from that part of the world is related, how come I have zero relationship to the ones who were not nobles (e.g., Karin's first and second husbands) as after all, they go back to C16 and have had plenty of time to mix? I should show cousinship to all of them, not just the nobles and the royals. It cannot be said their family tree is unknown.