It would provide a nice jump-start for Adam's resurrection, but I'm not 100% sure it would be entirely enough. Throw the embryo in the mix and it would probably work.
StrokeMeGoat wrote:It's a mystery as to where Adam/Kaworu's soul, or indeed, any soul goes after death in the series
If part of the body remains intact, the soul stays in there, as demonstrated directly in EoE and intimated in #23. (This doesn't hold for cored beings, since death results from breaking the vessel that contains the soul.) Adam's soul could end up at Lilith's feet still bound to Kaworu's head, and I suppose as long as nobody disturbed it, Lilith would be able to absorb it when she drops off and starts dramatically swelling.
IIRC it's actually ambiguous as to whether or not the Lance of Longinus was removed from Adam for the Contact Experiment that resulted in 2nd Impact or not, and whether or not it impaling a Seed of Life would prevent an impact from occurring if contact is made.
(A) The Spear had been removed from Adam at some point, and sent away from Antarctica for study. (At least, this is implied by the fact that it's found inside Adam but we're told about it arriving at the base a couple of months before the experiment.) The bindings on Adam can thus be explained as having been put there to keep Adam in check while allowing Adam's physiology and metaphysical properties to actually be studied -- something that would probably be impossible without taking the Spear out first. (How do you study Adam's ATF if the Spear is there preventing the ATF from manifesting?)
(B) In the 21' flashback, they say that the Spear is "sinking in" and they can't pull it back. Sinking into Adam? Merging? Frustratingly vague. Supplemental sources indicate that they did manage to use the Spear on Adam but for whatever reason it didn't work. Or perhaps it did, just not in the way you'd expect. Instead of putting Adam to sleep again, did it force her body to burn off in an explosion and leave nothing but an egg behind? If so, was this because of deliberate modifications Seele made while the Spear was away from Antarctica? *huge shrug*