I also read where Cruz hit each of those who quit with legal documents (probably just a copy of the contract they signed when they took the job) requiring they keep silent and not talk to the media. These are probably young people who aren’t going to risk getting sued.
I expect that you are correct, typical of any campaign practice. The non-sourced info may come from those family members or friends are not subject to non-disclosure and who may have been told they were leaving even before the kids exited.
Trump's lawyer then changed tactics, lobbing insults and threatening a lawsuit if a story was published.
"I will make sure that you and I meet one day while we're in the courthouse. And I will take you for every penny you still don't have. And I will come after your Daily Beast and everybody else that you possibly know," Cohen said. "So I'm warning you, tread very f***ing lightly, because what I'm going to do to you is going to be f***ing disgusting. You understand me?"
I’m sure everyone on every campaign has non-disclosures to sign with their blood. You can bet Trump has a warehouse full of documents he has his people sign.