There are many takes from the Fathers on which Zachary Jesus spoke of.
Some say it is John the Baptist’s dad.
But Christie’s point was: shouldn’t Rome “know” who the identity of Zechariah is, rather than speculate? We know who “Abel” is because Luke identifies the starting point: “
ALL of the prophets
from the foundation of the earth.” The way the Jews who Jesus spoke to (specifically the Pharisees & the scribes - who were also Pharisees) & the believing Jewish readers of Matthew’s gospel knew, was because this “Abel” was martyred in the
first book of the OT canon, which records “the foundation of the earth.” Therefore, for Jesus to be consistent with the last martyred prophet (“to Zechariah”) it would have to be from the
last book of the OT canon. If Jesus was not talking about the canon, but the last martyred OT prophet, then that would John the Baptist
HIMSELF, not his father. Christie pointed out that EWTN acknowledges that John the Baptist was the last OT prophet, not Zechariah. Plus, there is no record of his father being martyred.
The name conflation that Christie mentioned by Beckwith seems to be a much better fit than either John the Baptist’s father, and even Zechariah the son of Iddo. Christie also pointed out that after the Jews return to Israel after the Babylonian captivity, Jews did not murder God’s prophets like they did just prior to the captivity, like with Zechariah the son of Jehoiada, who
died in the same way recorded in Matthew Ch.23 & Luke Ch.11. And Christie also pointed out that both the New Catholic Version & the NABRE identify this “Zechariah” as the son of Jehoiada.
The name conflation explanation Christie proposed by Beckwith makes the most sense, since it was a known rabbinical practice even prior to the days of Jesus, such as Psalms Ch.34 that Christie brought up in the debate. Jesus does seem to be drawing from an already established canon which begins with Genesis (which is where we find Abel) & ending with 2 Chronicles (which ends with Zechariah), which this canonical order would have been accepted by the Pharisees who Jesus was talking too. Christie also referenced Nehemiah Ch.9 listing these boundaries. Horn’s rebuttal didn’t quite address all of this.