Existem muitos erros fundamentais em sua própria pergunta. Eu realmente sugiro que você volte e leia os livros porque sua compreensão das Relíquias e da ressurreição de Harry está errada.
Em primeiro lugar, Harry era o dono de Elder Wand, que ganhou de Draco Malfoy quando ele escapou da Mansão Malfoy. Draco se tornou o dono da varinha dos Anciões quando desarmou Dumbledore no final do Enigma do Príncipe. Ambos os pontos são explicados no livro.
Em seguida, Dumbledore nunca possuiu o manto da invisibilidade, ele pertenceu a James Potter. Dumbledore simplesmente pegou emprestado para examinar suspeitando que era uma das Relíquias. Após a morte dos Potters, ele simplesmente manteve-o até o momento em que Harry veio a Hogwarts e depois passou para Harry durante seu primeiro ano, dizendo-lhe que o manto pertencera a seu pai.
E o mais importante, Harry não voltou dos mortos porque ele foi capaz de unir as Relíquias. Ele voltou dos mortos porque quando Voldemort lançou a maldição mortal em Harry, ele matou uma parte de sua própria alma que estava vivendo dentro de Harry (como Harry era o Horcrux que ele nunca pretendia fazer).
Mesmo que uma pessoa possa unir todas as Relíquias, não creio que elas tenham a capacidade de voltar dos mortos. Como é explicado nos livros, Relíquias eram apenas objetos mágicos muito poderosos criados por Magos e todo o conhecimento sobre o possuidor de Relíquias sendo "Mestre da Morte" era apenas um conto de fadas que se baseava nesses poderosos objetos mágicos.
“So it’s true?” asked Harry. “All of it? The Peverell brothers—”
“—were the three brothers of the tale,” said Dumbledore, nodding. “Oh yes, I think so. Whether they met Death on a lonely road . . . I think it more likely that the Peverell brothers were simply gifted, dangerous wizards who succeeded in creating those powerful objects. The story of them being Death’s own Hallows seems to me the sort of legend that might have sprung up around such creations.
“You. You have guessed, I know, why the Cloak was in my possession on the night your parents died. James had showed it to me just a few days previously. It explained so much of his undetected wrong-doing at school! I could hardly believe what I was seeing. I asked to borrow it, to examine it.”
Harry Potter and the Deathly Hallows: Ch 35: King's Cross
A razão pela qual Harry não morreu também foi explicada por Dumbledore. A razão para isso não era as Relíquias, mesmo que Harry fosse o dono das três Relíquias quando ele foi para a floresta enfrentar Voldemort.
“But you’re dead.” said Harry.
“Oh yes,” said Dumbledore matter-of-factly.
“Then . . . I’m dead too?”
“Ah,” said Dumbledore, smiling still more broadly. “That is the question, isn’t it? On the whole, dear boy, I think not.”
“But . . . ” Harry raised his hand instinctively towards the lightning scar. It did not seem to be there. “But I should have died—I didn’t defend myself! I meant to let him kill me!”
“And that,” said Dumbledore, “will, I think, have made all the difference.”
“I let him kill me,” said Harry. “Didn’t I?”
“You did,” said Dumbledore, nodding. “Go on!”
“So the part of his soul that was in me . . . ”
Dumbledore nodded still more enthusiastically, urging Harry onward, a broad smile of encouragement on his face.
“. . . has it gone?”
“Oh yes!” said Dumbledore. “Yes, he destroyed it. Your soul is whole, and completely your own, Harry.”
“But if Voldemort used the Killing Curse,” Harry started again “and nobody died for me this time—how can I be alive?”
“I think you know,” said Dumbledore. “Think back. Remember what he did, in his ignorance, in his greed and his cruelty.”
“He took my blood.” said Harry.
“Precisely!” said Dumbledore. “He took your blood and rebuilt his living body with it! Your blood in his veins, Harry, Lily’s protection inside both of you! He tethered you to life while he lives!”
“I live . . . while he lives! But I thought . . . I thought it was the other way round! I thought we both had to die? Or is it the same thing?”
“You were the seventh Horcrux, Harry, the Horcrux he never meant to make. He had rendered his soul so unstable that it broke apart when he committed those acts of unspeakable evil, the murder of your parents, the at- tempted killing of a child. But what escaped from that room was even less than he knew. He left more than his body behind. He left part of himself latched to you, the would-be victim who had survived.
“He took your blood believing it would strengthen him. He took into his body a tiny part of the enchantment your mother laid upon you when she died for you. His body keeps her sacrifice alive, and while that enchantment survives, so do you and so does Voldemort’s one last hope for himself.”
“Without meaning to, as you now know, Lord Voldemort doubled the bond between you when he returned to a human form. A part of his soul was still attached to yours, and, thinking to strengthen himself, he took a part of your mother’s sacrifice into himself.”
Harry sat in thought for a long time, or perhaps seconds. It was very hard to be sure of things like time, here.
“He killed me with your wand.”
“He failed to kill you with my wand,” Dumbledore corrected Harry. “I think we can agree you are not dead.
Harry Potter and the Deathly Hallows: Ch 35: King's Cross