How do we know ?
Are you serious?
It's one of his most valuable people according to him.
He's new to the job according to him.
He's hving one of his first meetings, making his first decisions.
And it all went west on him. What do you a need, a diagram?
As for being indispenable, I know Shell isn't that stupid and I'm reasonably confident about myself, so that leaves you Mr Employer.....