My original question to you was: Were Moses and Elijah dead or alive when they appeared with Jesus at the Transfiguration? You have not given a satisfactory answer as to whether they were dead or alive.
The account of the Transfiguration is absolutely relevant to the question of “praying to dead people” because you can’t even tell me you know who is dead and who is alive.
Both are and always were, spiritually alive. Can you show me one instance where the Jews prayed to them? Is there one instance anywhere in the bible where observant Jews prayed to people, living or dead?