Q: What do you do if your lead developer disappears and left no documentation?
A: Invent a time machine…
Seriously, this is the reason you demand documentation be done incrementally. This is why you check periodically that it is present. This is why you don't give a position of leadership to a person who refuses to write documentation.
It doesn't matter how loyal a developer is. He can always be hit by a bus. His life partner could always get their dream job in another state. Documentation fills the hole that opens up when an important developer leaves. Documentation helps new hires get up to speed faster. It provides all the continuity you're going to get.
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