The transfiguration of Jesus at the Mountain

Why Moses? Why Elijah? Why not Enoch? I say this because Elijah was taken up into the heavens, same for Enoch, but it is mentioned in scripture that Moses clearly died What made the disciples think that it was, Moses and Elijah, that were with Jesus during his transfiguration if they had never seen Moses or Elijah before then? Is there more to it than an explanation such as divine revelation? I am recently reading the New testament vigilantly and this part really captivated me for some reason. I would appreciate a very detailed and holistic answer if possible.