I am relying on "inside information".

I suppose that means this is an "appeal to authority", but, still, if a person critical to making software work is gone, and the company fails specifically because they can't make their software work, what else am I to assume?

(Needless to say, sometimes I've been that person.)

I'll buy that a company can be set up so it is dependent. Outside of some special cases (subset of technology and relationships), I think that doing so is usually unnecessary and the "indespensable" label is typically untrue, especially when it comes to biz folk.