Isaac Sacutto - Questions from Ton Tielen

Ton Tielen There are some issues with the Zacuto-familytree on Geni. com, I think.
In the 16th century two generations are postulated about whom nothing is known: the son and grandson of of Samuel ben Abraham Sacuto. He and his father, Abraham Zacuto, the atsronomer, fled from Lissabon circa 1504. How likely is it that they had offspring in Porto, Portugal three quarters of a century later?
The portrait accompanying the item about Abraham ben Samuel Zacuto, the astronomer is not his.
The marriagebans of Isaac Zacuto and Hanna Alfarin dated 13 September 1686 in Amsterdam, state that he was from Amsterdam, that he is 33 years old (so born in 1653) and that his parents are dead. Logic then, would have it that he cannot have been the son of Moses Zacuto, also known as the REMEZ, for Moses lived in Italy in 1653, and was very much alive in 1686 – dying in Mantua in 1697. Compare this to the version here: Isaac Moses Sacutto
The link between Amsterdam and Sislevitch in Russia circa 1800 has all the markings of a wild guess. Isaac of Elieser Sacuto states his intent to marry Deborah Abenhacar Ximenes in Amsterdam on 27 August 1808 in the presence of municipal authorities. They did indeed marry, and their ketuba is dated 14 Tisri 5569, or 5 October 1808. Their child – no first name - is supposed to have been born in Sislevitch in 1809. But Isaac Sacutto, his father, is buried 28 October 1810 in Amsterdam. Two years is enough to travel from Amsterdam to Sislevitch, have a son and be back in time for his own funeral, but is it likely? Could the son have been born in Amsterdam? Also not likely for he birth register of the Portuguese Jews at the time does not mention him. Next the unnamed son has three sons of his own, in Sislevitch, none of them has the name Isaac. Unless there exist other documents that proof this link, or make it likely, it should be rejected. The supposed mother Deborah Abenhacar Ximenes, was also buried in Amsterdam, 3 November 1848.