Question:
Jon looked for Adrin and San'doro but saw neither.

Does it follow that "Jon couldn't find Adrin or San'doro but saw someone else. "?
Answer:
it is not possible to tell

Question:
The question now was, did Annette really know more?

Does it follow that "Somebody knew Annette didn't know any more."?
Answer:
no

Question:
In fact, she learned much from both, the knack for power-politics of the one and the massive popular appeal of the other.

Does it follow that "She learned nothing from either of them. "?
Answer:
no

Question:
My wife cannot say the same ...

Does it follow that "My wife did not agree with that."?
Answer:
yes