You again civic deliberately found another way to avoid my/ this conclusion and come away with your own slant and non-scriptural conclusion.
The Spirit of the Father God 'houses' ALL spirits whether slated/planned or existing, in use. Elijah's spirit already existed and Christ's at that time was only planned for as spoken of even in 1 Peter 1:11 with the prophets concern of his suffering.
The Father, through his own Spirit governs when any created spirit shall exist. This is key to understanding this entire conversation/discussion.
I think you need to take off those Trinity glasses in order to see straight....