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Um think you got your wires crossed here. Also messiah is the righteous servant. He couldnt be otherwise otherwise you looking for a king who is not righteous. JEsus is righteous AND he also rules with a rod of iron. Its just israel or specifically Judah were blinded by their own righteousness thinking they actually didnt need a saviour, just a ruler. Because they were thinking in the flesh and worldly terms. Again as Isaiah asks who will believe our message??
You and I after the events know they are one and the same
I am asking how any OT person could see them as the same.
This is part of the mystery, The fact messiah was the suffereing servant in Is 53 was a mystery
Why did God do this, that is my question.