Question:
We all know that Satoshi disappeared after Gavin talked to the CIA...
It is mostly assumed (I think) that Satoshi left the project voluntarily..
But how do we know that the CIA didn't get to him first?
We don't.
Is it not plausible that the CIA was successful in tracking him down?
Not very plausible, no, as Satoshi probably used hid his IP very well, etc... so they would have nothing to go on.
In any case, even if they did, so what?