Why couldn't they make a vessel for Adam sooner?


In Evangelion, why couldn't they have made a vessel for Adam sooner or brought
an angel close to have started the Human Instrumentality Project.

What was the point of Rei also then? Making a vessel for Lilith's soul hardly
serves the purpose of the project, and will go to waste anyways when it
occurs. How was she significant to the project and what is her significance?




Gendo's own scenario for the Third Impact was "the forbidden fusion of Adam
and Lilith", his goal was to be reunited with his dead wife Yui who died
during the Contact experiment which lead to the Second Impact, for this he
required 2 things, Adam and Lilith.

In the aftermath of the Second Impact, Adam's Soul was separated from it's
body which had been reduced to an embryonic state, Adam's Soul was recovered
and stored in the 17th Angel Tabris (Kaworu Nagisa) which SEELE sort to use in
instigate their Third Impact by having him make contact with Lilith, if it had
worked the result would be an Adam Dominated Third Impact under the control of
SEELE.

One reason why SEELE couldn't send Tabris quite possible because he wasn't
ready to be used yet but the other main reason was the Lance of Longinus, so
long as it was in Lilith the Third Impact couldn't start (it was placed there
to stop it but in a way that they could remove it one all the components for
their plan were prepared), it wasn't removed until it was used as the last
ditch effort to kill an Angel which no EVA could reach, it's not known how
SEELE would have acted had Gendo not ordered the lance to be used.

Rei's purpose was all Gendo's Third Impact Scenario, not SEELE's. Gendo made
SEELE think he was on their side however he was working on his own plans to be
reunited with Yui, who Rei is a clone of. much like with SEELE's plan, Gendo
couldn't act while the lnace was in Lilith however when it was removed and he
could confrim that SEELE couldn't interfere with another Adam he executed his
plan (which we don't see until End of Evangelion). Gendo's plan was to control
Rei in a Lilith Dominated Third Impact but Rei rejected Gendo and took the
embryo of Adam from him and fused with Lilith.

