You can copy/paste all the articles you want and the fact of the matter is the father back you trace dogs the closer kin they will be. This article is referring to a very small group of men and dogs. There are thousands of men and dogs making up this breed now. This is common sense that they dogs in the beginning would be closed related. If you start with few and in the end yof have many the few had to be bred together as well as their offspring, thus making them kin. That is the argument and you are wrong so get on Google and copy someone else's article you know nothing about to try and make yourself look smart.
If you are talking about closer kin in the framework of time and history, like Adam and Eve then yes, if all breeds of dogs came from a pair of wolves at one time, then in general as time goes on the population as a whole becomes less closely related as it fans out and gets farther from the original individuals, but most breeds of dogs were started with a few different breeds that were crossed to make a small group of closely related dogs and then the population of the breed expands from there. I have a couple books on the plott bros but have not read them yet, so I don't know about Plotts specifically but, if they didn't start with different breeds of dogs or with a group of scatter bred dogs then they didn't make their own breed, they just refined one or made their own strain. I know breeds like the Dogo, the Tosa Inu, Catahoula, etc were made from from unrelated breeds, sure they went back to the "Adam and eve" of dogs but they would still be considered unrelated just like i would be considered unrelated to you oconee. All the breeds I just mentioned started with breeds of totally unrelated dogs that were bred together to make a small group of closely related dogs that as time goes on and the population of the breed grows, becomes less closely related. Even the Kemmer cur started from a small selected group of Mtn curs that would be considered less closely related, that were then bred to be more closely related and as the population grew, it became generally less closely related, and I would consider kemmers a strain of mountain cur, not a separate breed of dog. In theory to make a new breed you would have to start with a small group of animals less closely related, breed them to each other, making them more closely related, and then as the population grew and they spread out into different peoples hands and spread geographically they would become less closely related. I think the terms can make this concept confusing, because in general we are all as closely related as we are ever going to be, as time goes on each generation of humans becomes less closely related as we get farther from Adam and Eve but individuals or groups of people can become more closely related by interbreeding or inbreeding, hopefully there's not too much of that going on. I have always wondered if the royalty of the world, line bred themselves not just to create stronger ties but more robust and successful heirs to their kingdoms
