If the Ot had not shown us what to look for, then trust me, not one person no this earth would have known that Yeshua was Who He was. In respect to them them not knowing him, why not turn to the facts.
Rom 11:7 So this is the situation: Most of the people of Israel have not found the favor of God they are looking for so earnestly. A few have—the ones God has chosen—but the hearts of the rest were hardened.
Rom 11:8
As the Scriptures say, “God has put them into a deep sleep. To this day he has shut their eyes so they do not see,
and closed their ears so they do not hear
So with out looking to the OT what scripture tells us about this? Can it be oh Is. 29:10? or juast maybe it was Duet. 29:4? Nope can't be, the NT as you said has nothing to with the OT.
So even though Yeshua lived His life in every respect to Torah, (the full embodiment of Judaism) fulling ever Feast, Law, and Word spoken of him Perfectly, this in no way shows any representation of Judaism? An interesting tail. Though it holds to basses in fact, it is cute.