[jdoliner]

> The ex-admin's bosses probably thought they were the important ones, and that this worker was a replacable cog, but they found out the hard way that this was not the case.

I don't think this really indicates that at all. Maliciously inflicting damage on the company when you're fired is very different from being irreplaceable. It makes it risky to replace you, but that's not the same thing.

[sverige]

Right. If they were truly irreplaceable, they wouldn't have been fired in the first place since there would be no one to replace them.