End of Evangelion - Why does Misato dissolve into LCL and why did Asuka re-materialize?
Here is a stab at my question to try to clean up my own mess:

Hakase's comment is correct as a scene is shown that all the NERV personal killed by Japan's military did dissolve during instrumentality.


So the answers are:

Misato dissolved into LCL because all humans- dead or alive, dissolved into LCL during instrumentality.

Asuka also did dissolve into LCL- so all humans that ever existed could re-materialize after Shinji rejected instrumentality.

To clarify this:


  I'm confused because one of the SEELE guys seemed very determined to remain alive until instrumentality occurred


I do not have as much basis for the following but I think the SEELE guy wanted to stay alive to make sure that the Human Instrumentality Project would happen, and to see it actually occur after all their efforts- as it was the organization's ultimate goal. So it was a misunderstanding to believe that humans must be living to be a part of instrumentality.