My closest Y match is also a Campbell, but with no known relationship. The TIP report shows probabilities of shared ancestry of 68% within 2 generations and 90% within 4. We both took the Y-67 test. But the likelihood of shared ancestry within less than 6 generations seems remote. My male line ancestry is confirmed by au-dna back to my GG Grandfather, who immigrated from Longford, Ireland in 1842. Communication from the other test taker has not been forthcoming, but he has a convincing paper trail back to Ireland (immigrated abt. 1805), though I don’t know from which county.
The geography in the US between the families doesn’t line up. My Grandfather, G Grandfather, and GG Grandfather all travelled for their work, but it seems extraordinary for one of them to be responsible for an NPE with a geographically remote Campbell line.
Does it make more sense to consider these lines as likely to have diverged in Ireland shortly before the first group emigrated?