Eric Schmidt, who is an exceptionally rare talent understanding engineering, business and politics at the same time was changed to a person who just want to show more ads (the product that makes money) with 0 engineering background.
The best are / were there before they quit to create companies, like OpenAI because it was easier than changing management.
Also I bet Sam Altman would be able to reverse a binary tree (it's a trivial recursion) even if he was never at Google: it's just part of being a professional programmer.
There's also this gem of how google wanted one of the creators of C to take a C test https://www.theregister.com/2010/04/21/ken_thompson_take_our...