Greek to me

you forgot to mention Leonardo of Pisa's work which he "borrowed" from both Islamic and Byzantine sources. Aquinas lived in the late middle ages. His work was meant to replace Augustine's theology (415 AD); Augustine did not know Greek either. His work smells of Plotinus (and his Pseudo-Platonism) and Persian dualism filtered through other cults. Also you seem to ignore St. Severio or Boethius: the author of seminal the Consolation of Philosophy as precursor to our Islamic colleague. Also there is alot of linguistic algebra in Boole, Peirce, Russell, whitehead....
Dante was two generations younger than Aquinas. 1100 is the beginning of the end of the Middle Ages. A single generation after Dante (e.g., 1350), the Greek language came back to Florence.
the "everything converges" phrase was pure irony. The origin of ideas is quite relevant. His ignorance of greek and the absence of the actual texts (i.e. the Greek Bible and Plato and Aristotle without the layers of varnish) make much of what he wrote defective. That argument was 1st made by Erasmus around 1500.
I am a Catholic, but I am not uncritical. Very little converges. Very few things are both true and valid. the crack: We steal the best and condemn the rest was ironic.