A thorough review of the GENI pedigree of Don Isaac Abarbanel shows that there is glitch: the 23rd great grandfather (Elazar ibn Shmuel al-Hurga, Alluf al-Andalus & Resh Kallah) is shown as the son of Mar Sar Shalom ben Boas After a brief discussion on the profile, it has been concluded that this is not a possible sequence (absent extraordinary evidence to the contrary). Therefore it appears that the patriline connection with the exilarch-Davidic line ceases there. However, several generations subsequent to Don Isaac Abarnanel, his grandson marries Esther Abravanel who is a Davidic descendant on the Yakhia line, meaning that after this point, the Abravanel line is a Davidic lineage through a grandmother.
This information would negate any further claims to a ydna connection between modern day Abravanels and the ancient line of Davidic exilarchs, subject to alternative pedigress differing from the one shown on GENI. This leaves the Dayan of Aleppo line as the only known, coherent Davidic dynasts.
I have just updated the article cited with the following in the footnotes:
Footnote 31: "...the line of Mar Sar Shalom ben Boas is now considered to be a Cohanic line which descends from a Jewish daughter of Bustenai (see fn 33), which means that even if the al-Hurga to Mar Sar Shalom connection is accurate, the line is not partiline Davidic."
Footnote 33: "There has been a longstanding debate among scholars regarding the mothers of Bustenai’s offspring. According to historical legend, Bustenai was given a Persian wife following the Islamic conquest of Persia, and the maternity of his descending lines could stem from the Persian wife, or his Jewish wife. According to my research, the Dayan, Shaltiel, and Benveniste lines, if accurate, would descend from the Persian wife, while the Cohanic Abravanel line (if accurate, see fn. 31) descends from the daughter of the Jewish wife. The Yahia line is from much earlier and avoids the Bustenai discussion."
Private User should we sever Elazar ibn Shmuel al-Hurga, Alluf al-Andalus & Resh Kallah from his "father" Mar Sar Shalom ben Boas
Upon Shmuel-Aharon Kam's request, I went ahead and made that cut. I think what happened here is that certain intellectual history was substituted for genealogical fact. This can sometimes happen with the exilarchs and gaons as well where a succession of gaons or exilarchs is extrapolated to mean a father-son relationship with the prior one, which is sometimes but not always true.