Personally I thought the reply from Boanerges was clear, comprehensive and helpful.
If you look up the original meaning of the word spirit as used in that passage you will find that Strong says it is Mental Disposition. In other words with the same mental attitude as Elias.
As for reincarnation. Here is
Heb 9:27 from 6 different translations.
(ASV) And inasmuch as it is appointed unto men
once to die, and after this
cometh judgment;
(ISV) Indeed, just as people are appointed to die
once and after that to be judged,
(KJV) And as it is appointed unto men
once to die, but after this the judgment:
(KJV+) And
2532 as
2596, 3745 it is appointed
606 unto men
444 once530 to die,
599 but
1161 after
3326 this
5124 the judgment:
2920
(LITV) And as it is reserved to men
once to die, and after this, Judgment;
(MKJV) And as it is appointed to men once to die, but after this the judgment,