The Jews don't dispute that Zechariah and Isaiah hints at a (king) messiah (remember rabbinic Judaism that survived is the Pharisaical Judaims of Jesus' times, and they were messianic/apocalyptic believers in a messiah; they just think it was him! And your evidence does not prove that it is Jesus without reaching for the New Testament! What kind of a "proof" is that, and how can anyone blame the Jews, given that they didn't have the NT!?
How can the NT compare with the live testimony and miracles of Jesus Himself?
“What kind of a “proof” is that, and how can anyone blame the Jews, given that they didn’t have the NT!?”
But the Jews in Jesus time did have one who claimed to be the Messiah, Jesus, and he authenticated his claim by miracles; applying the prophecies of Isaiah to himself; and the resurrection. Each time he did they rejected the claim. They were looking for a political Messiah who would usher back in the “golden age” of David and Solomon and when he did not accede to their aspirations they rejected him.
The requirement for salvation has always been faith. The object of one’s faith for salvation has always been God. What has changed through the ages is the content of a believer’s faith. God’s requirement of what must believed is based on the amount of revelation He has given mankind up to that time. They had the living Christ and did not believe.