Yes, ggdncr2, it sounds very much as if you and I have followed through along the same genealogical trails. The Margaret Walsh/ County Meath connection (from that obit) was one I'd pondered on too. Even married in Canada, one could imagine that John and Margaret would have originated from the same place in Ireland. But I've been stymied at every turn when I tried to find them (Mother-Liz, James, Daniel, John and Thomas) back in Ireland, or on a ship crossing over.
County Cork baptism sounds very interesting and I'll have to look into the lead you've given here. I'd kind of dead-ended a few years ago when I went the Meath (and the Kerry/ Derry) route.
Would you date their year of emmigration from Ireland as 1832-33? The earliest 'definite' record I have is Daniel (John's bro) marrying Rose Kiernan sept 1835 (Canada), and their first son James (1837) the first Canadian-born of that family group.