Thanks to Trish, Spelk and others who have contributed so positively to this question. It is very much appreciated. The 80/20 rule applies to genealogy as it does elsewhere; 20% who are able and experienced researchers, fading into the other 80%. My age puts me well into the 80% and a few hours of research glazes my eyes and starts the custard process in my brain. Regrettably I will not be delving deeply into original documents.
I use others peoples research freely but try to keep an open mind on conflicts such as this one and ask for help as necessary. WikiTree does offer a way to unequivocally identify profiles but dealing with this question made me appreciate FamilySearch does the same and has been doing it for much longer than WT and probably has a much larger database.
It will take some time to work through the whole string.
TRISH, you latest post suggests two William+Mary families, but surely they must be the same one ?. As for Raisbra, he has many spelling variations but this one seems preferred. I have an excellent photo of him from within our extended Australasian family. The thought that Griffin and Thomas could be one and the same is interesting and the evidence reasonable, but the confusion may have arisen because his father is Thomas.
WT allows FamilySearch as a source, so at the moment I feel much as though I’m simply copying these older profiles across from FS to WT.
Little wonder I prefer unequivocal Big-Y matches to arguable genealogy connections.