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The answer is plain. The mystery which was hidden from the beginning was revealed through Christ and the cross. THe apostles did not get magic knowledge, or a tiny taste of omniscience, but they studied the scriptures in the context of the resurrection, to understand the mystery. The more they studied, the more they understood, and so the more they shared.

As mentioned earlier:

:Mark wrote that the story began with the preaching of John the Baptist. <ref>[[Mr 1:1]] ¶ The beginning of the gospel of Jesus Christ, the Son of God; Mr 1:2 As it is written in the prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee.</ref> Later, with more time to study, they saw the prophetic riddles extending back to Abraham. Matthew begins his gospel there.<ref>[[Mt 1:1]] ¶ The book of the generation of Jesus Christ, the son of David, the son of Abraham.</ref> With more time, Luke was able to push the beginning of the story back to Adam. <ref>[[Lu 3:38]] Which was [the son] of Enos, which was [the son] of Seth, which was [the son] of Adam, which was [the son] of God.</ref> And with the most time, and isolation on a prison island, John was able to push the start of the story all the way back to the first words of Genesis. <ref>[[Joh 1:1]] ¶ In the beginning was the Word, and the Word was with God, and the Word was God.</ref>

:The differences in how stories are told between the gospel authors tell us how much more they could understand the prophetic riddles of the Old Testament. They were able to correlate even more details concerning the life of Christ with the prophetic riddles. Some details did not need repeated since they were well known from previous teachings.

The 'Q' document