Under the rules of science as I know it, common descent is a tested and validated hypothesis. It is so thoroughly clear, it is often used as an assumption for other reasoning in science. That does not mean it has not been tested or validated, nor does it mean that all claimed tests are actually valid.
That does not mean its true, but is the best scientific understanding we have at the moment. You are welcome to disagree, but I insist you keep the scientific debate about common descent exclusively to threads about common descent. If you like I can even set up a thread all your own, where you can make your case against it. However, I do not want every thread to degrade into a repetitive debate.
So dispute it if you like, but not on threads that are not specifically about the science of common descent. Is that okay with you @colewd?