I look forward to being able to read that paper in the future, as I'm quite interested in the history of the family in general terms, and have read the 4th Duke of Leinster's history "The Earls of Kildare and their ancestors". So well done on that work.
I think your work on taking an in-depth look at the documents about the alleged Gherardini origin is a most welcome development. Very often the denial by particular historians of a family's "origin myth" becomes as great a myth as the original and is taken for granted. It is always good to revisit the original documents and examine how various historians and commentators have used those documents. So in this regard, I'm looking forward to reading it.
At the start of this thread, someone mentioned Sean Murphy calling the Gherardini origin "complete nonsense" or words to that effect. Personally, I think Sean Murphy has done great work in deconstructing several examples of "bad genealogy", but in my opinion he also tends to "tilt at windmills" and throws the baby out with the bad water in many cases (if you'll forgive the plethora of mixed metaphors there!). I'd be interested in seeing what his evidence is against the claim.
(Just to be clear, while I personally believe the Tuscan origin claim is extremely believable, I am range from completely neutral to slightly sceptical about the Gherardini claim - which is why I would be very interested to read your work, as I am very much open to the argument).
Yes, you're right as I mentioned about the DNA not being 100% certain. Hopefully we could in the future move towards even more certainty, though it is yet to be seen how certain any evidence could be. It would be very interesting if DNA samples could be got from the Duke of Leinster (FitzGerald) and the Marquess of Lansdowne (FitzMaurice) who both have genealogical papertrails back to the 12th century to see how their DNA is connected. It would also be interesting to get more DNA data from Carews living in the UK who are also said to have descended in the male-line from Maurice fitz Gerald. (Baron Carew claims descent from this family, and though very likely, I would also think it extremely likely that the family may descend from the Gaelic O Carrain of Moburne, Tipperary, who adopted the name Carew and claimed the Carew inheritence of lands in Ireland in the 15th/16th centuries - again, another question which DNA could possibly solve).
Well done again on your work!