JMNT(i)
50 "neither are you logically reasoning or taking into account the fact that he is progressively bringing it together for you (or: it is advantageously bringing things together for you), so that one man can die over (or: to the end that one person should and would die away for the sake of [in the sense of "instead of"]) the People, and not [that] the whole nation should destroy itself!"
51 Now, he did not say this from himself, but to the contrary, being chief priest of that year, he prophesied that Jesus was being about to be dying away over [the situation of] (or: for the sake of) the Nation (or: ethnic group),
52 and not over [the condition of] the Nation (or: on behalf of the ethnic group) only, but further, to the end that He could gather God's children together – those having been thoroughly scattered – into one (or: so that He would lead together into unity God’s divided, dissipated and disintegrated born-ones that have been dispersed throughout).