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I can go with that not all dispensationalists believe that there are two gospels. But I believe that this folly originated from some early dispensationalists (if this is incorrect, I will retract this statement). Anyway, just because gentiles are not required to live like jews (and vice versa) it does not mean that each has its "own" gospel.
And I agree'd with your main point whole heartedly just did not want people to think ALL dispy's believed that is all.