The Irish are Not Celts

[Sumskilz]

Well if the study did use Y haplotypes as well, its conclusions would be more accurate, but there are still many factors that could cause the frequency of haplotypes of a specific origin to be disproportionate to the frequency of genes of other origins. I have my mother and fathers haplotypes which only give evidence of two direct lines, not of all the other individuals that contributed to my DNA’s makeup. At this point in our understanding, haplotypes are just a convenient starting point.

IrishHitman's hypothesis is perfectly plausable based on the evidence, as are many others.