[EVA] yui inside????

[Victoria]

>Ritsuko says that this happened once before during the test phase 
>with Unit-01, six years ago. That was Yui Ikari. She apparently 
>became the soul of Unit-01. However, since Eva's 
>need souls to operate, how did she achieve 400% synchro with Unit-01 
>if it had no soul? 

IMHO, Gendou set this experiment up to incorporate Yui's soul into Unit 01.
 I think he had the entire scenario planned from the beginning.
Victoria