If John was the expected Elijah to come before the Great and Dreadful Day (of Judgement), meaning, everyone who was deemed worthy to stand in judgement was resurrected (via the regeneration) at that time to receive judgement.
'....Honestly I am telling you the truth, the hour shall come As it is Now, when the dead shall hear the voice of the son (speaking from the bosom of the Father, the Grace of Yah), and those who hear, shall rise from their graves....'
Thus the first advent was a resurrection from the dead, where both the Father and Son testified of each other, and concluded we were to be pardoned at that time because we did not know what we were doing;
And once the head of John was removed, then the head of Adam was placed on a cross, whereby both Father and Son paid for our sins, and incurred the promised curse;
Seeing how John/Elijah/Abvraham/Adam was scarcely able to satisfactorily turn the hearts of the resurrected forefathers toward their resurrected children, and visa-versa.