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The fact that the eleven prayed and received no answer (recorded in scripture) shows plainly that they acted outside the authority they were given.
As plainly stated in the Revelation, there are exactly 12 apostles.
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Scripture doesn’t say if they recieved answer form God. They appear to have thought they received an answer by casting lots. What other evidence do you offer. I say the numerical structure of scripture is evidence.
Revelation also lists just 12 tribes. Two tribes are mising. There is no list of the apostles but two are missing.