Indispensable != better at their job. Indispensable != Contributes more. If someone you work with gets hit by a bus tomorrow, can you still ssh into the server

Indispensable != better at their job. Indispensable != Contributes more. If someone you work with gets hit by a bus tomorrow, can you still ssh into the server? Can you continue working with the code they wrote? Or is that all knowledge lost? If they're not indispensable that means that's all well documented.