You mean Samuels spouse or parents I take it? Yeah I see that plus I've since realised you already had that info - seen your non-ancestry forum conversation with Ron I think it was!
Hey I think you are doing well cheif, further back in generations than I am dude, maybe you dont realise that using griffiths map feature you can actually pinpoint where peoples houses once stood here in Ireland. Sometimes you will see a bump in a field ie buried rubble, other times actual building still standing with extensions or perhaps complete rebuild on old house outline.
Also, if we kinda happy with townlands then we can look at graves in the area which often record peoples townlands, nicknames, dates etc - and other buried relations - perhaps the older gen!
Also maybe both your branches still have cousins/descendants in the area - a bit of census and familysearch work would help with this.
I'll have another study buddy (hehhee nice line that) maybe I'll find Samuel or more about him.
I didnt study your whole familys up to present day so I'm not sure - but if you know of a male mckenna from your wifes line, if you both get y-dna tested it will answer how close your Y-Dna and his ie her male line are if this is your sole purpose of this research.
Anyway goodluck 4now Dan