Yes, it all helps... And I believe that the total evidence strongly outweighs Matt 23:2-3...
But Matt 23:2-3 seems to be very explicit. Without the whole evidence of context AS context, it can be taken very wrongly.
Paul talks about spiritual blindness, after he speaks to Israel's blindness in 2 Cor. 3:12-16. Paul speaks of the blindness by the god of this world, in those who do not believe the "glorious gospel of Christ." 2 Cor. 4: 3-6.
One is blindness by God to Israel. The other is blindness by Satan.
The former is because of Israel's rejection of Christ as Messiah. The latter is because of their minds being blinded by the truth of the gospel.
And what is the Gospel of Christ?
For by grace are ye saved through faith, and that not of yourselves, it is the gift of God, not of works, lest any man should boast." Eph. 2:8,9. Anyone who would reject this gift is blinded by the god of this world, and depends on WORKS to establish righteousness and salvation.
Same old Tradition, different face.