Probably a lot of the same emotional manipulation that goes into spycraft? IDK all I know about spycraft comes from novels.
Hey we see your true potential, we know your exec team and we can help shape the company so you and the company succeed together. And we can coach you so that you know how and when and who to deliver your message to when the time is right.
It worked both ways. Revolving door with clients was absolutely encouraged wherever it wasn't forbidden by law or regulation. Implicitly as an employee in good standing it felt like this was a standing offer should you decide to switch to an industry role, and I saw it often.