I have been in too many startups that died because they lost or failed to recruit one particular person---or in the case of LMI survived (for a while) because I recruited one indispensable classmate who made their LAMBDA processor work---to believe this.

A reverse example would be the receiving clerk at Intel who single-handily almost killed them as mentioned in Chringley's book.

In my experience, just about every founder of a startup is "indispensable" after you shake things out a bit---make a single mistake with any of them, and you're not likely to survive.