"it's because that same group is already singled out by the opposition and granted a "free pass", redemptively and eschatologically "
That's not my understanding.
Dispensational theology posits a future "unfreezing" of the Jewish nation. But until that time there are as spiritually dead as any other unbeliever.
No one can be saved by merely keeping the Law apart from faith in Christ.
Duly noted. But there are dispensationalists who would disagree with you and I both, AT LEAST in practice (by not evangelising them or calling them to repentance) IF NOT in outright theology. I can't speak for OP, but it's this dispensational school that I myself am railing against.
The gifts and calling of God are irrevocable.
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Well put! Thanks.