This Wikitree source has been disproven by cousin matching study. See Discussion section.
Cousin matching increases by degrees and in a large group study, it can be determined on what chromosomes cousin-ness happens and at what levels, over all, in a group; given that each generation receives a smaller portion of the preceding generation and is why large group studies are need to determine who is kin and in what amounts of centi Morgans and in what haploblocks.