I've had my genealogy done via 23andme, and Jacob Eirich/Irick/Irish was (1787-1861) was my great-great-great-grandfather. And I'm a retired medical librarian, but I don't understand what you're asking.
Your uncle's grandfather was adopted, but your uncle has a genetic match to the Iricks. Is that correct? I don't think my 23andme profile chip used yDNA, but if you're on it, we can 'share' info.