Bear in mind the following (and feel free to correct any factual errors):
1. Earlier blood-related descendants of Francis Gano wrote a memoir (Rev. John Gano) and a genealogy (the Denman Family History) stating that the American Gano patriarch was originally "Francois Gerneaux", a French Huguenot refugee from Rochelle, France who arrived in New Rochelle in 1686.
2. But based on pure speculation by the NY historian, Riker (in whose work I have found yet another very detrimental error wherein he confused the names Denton and Denman, so he seemed good for that sort of thing and not a true genealogical authority) -- some recent anonymous or not well known, perhaps amateur, 'genealogists' have made the logical leap that this Stephen Garneau (var. Sp. including Genejoy and Gueneau, Geneau, etc.) of Staten Island, an accused "Papist" (i.e. Catholic, not Huguenot) is the real patriarch of the Gano family. I disagree, and I'll explain why.
2. Besides the obvious (Huguenot and Catholic being incongruous religions), the ship on which they say Stephen Garneau was a passenger (the Gulden Bever or simply the Bever or Beaver), embarked from from Holland and arrived in "New Netherlands" (not New Rochelle).
3. The man they claim lived in Staten Island (not New Rochelle).
4. Dates don't match, spouse info doesn't match.
5. Names don't match.
6. Offspring doesn't match.
7. Stephen Geneau (sp.) of Staten Island, with wife Lydia "Matereu" (var. Sp.) was never claimed by either the Ganos or the Denmans earliest descendants.
8. In one Dutch Reformed church baptismal record dated Feb. 4, 1663, we find Stephen Garneau as father of Sara with witnesses Jacob Cobjouw and Magdalena du Trieux (a French name). For mother it is only noted, "N. Materum" which should translate to "N/A" i.e. "immaterial". The mother's name is not given in the record.
https://www.familysearch.org/ark:/61903/3:1:3QS7-L9CL-PJ5R
9. Citations for claims that Mary Gano was born Oct. 17, 1660 do not check out when followed and examined. It's simply not there (if you see it, please point it out to me).
10. In any case, if Mary was born in 1660 she would have been quite old by the time she married Mr. Brooks and had two more sons, Deacon Samuel and Jacob Brooks (age sixty when the last one was born, which is really absurd).
That alone (although I'm sure there's more) is enough to blow the theory to shreds, imho.