You are treated as one of the gang, and people will often willingly share information with you that may even fall outside of what you need to know.
If someone is motivated to then collect/disseminate that information, it is exceedingly simple. It is always going to be difficult to stop these sorts of leaks.
I have close to zero trust in the abilities or goodwill of Federal entities.
The problem is "clout" seekers are all over the military. Have a conversation with a person in a highly selective field in the military and you'll find a crazy high amount of capable narcissists and God complex egos to go around.
This is why I'm saying to a degree this isn't a surprise to people in the IC.
It does also point towards a certain degree of disillusionment within military circles, the rank and file ar probably not thrilled about the idea of being sent overseas for another Iraq/Afghanistan style disaster, only in eastern Europe this time.
We don't have any evidence around your claims other than speculation and that's not the point of this forum (in fact, the Discord where these docs were leaked seems like the exact kind of place for that comment).