Orson Pratt’s Works, pg. 219; “John the Baptist is seems was the last person who held the keys of the Aaronic Priesthood, and, therefore, he would be a suitable person to restore that Priesthood once more to the earth. In order that John might be qualified to fulfill all the duties of his mission as the Lord’s messenger, God raised him with many others from the dead after the resurrection of Christ.””
Matthew 3:1-4; “In those days came John the Baptist, preaching in the wilderness of Judaea, 2 And saying, Repent ye: for the kingdom of heaven is at hand. 3 For this is he that was spoken of by the prophet Esaias, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. 4 And the same John had his raiment of camel’s hair, and a leathern girdle about his loins; and his meat was locusts and wild honey.”
John the Baptist did not qualify to hold the “Aaronic” priesthood. He did not dress or eat appropriately. He did not keep his hair in the manner it was to be and he did not follow the marriage law that priests were held to.
Secondly, dead people do not appear to living people to pass on a priesthood they’re not qualified to hold.