It's easiest to mental model (for me) that those closest to the money are the last ones out the door. They control the purse strings and what the money is spent on.
So if you are the CEO, you are basically one or two tiers away from the money. Those who report to the CEO 5 levels deep are pretty far away.
Believing that someone very close to the money is going to replace themselves is incredibly naive.
No, the CEOs aren't going to replace themselves. The owners might replace them, though.
From Schlock Mercenary: "I can replace desk-meat like you with a Turing dynamo, an Eliza helix, and a white noise generator."
If you could replace yourself with a program running on your laptop that took all your meetings and responded to your emails for you, while you did other stuff, wouldn't you? It's not naivety, I can see it as very appealing to this characature in my head of a CEO who just wants to go off and be lazy and fuck their secretary.