Another clue may come from the meaning of the name Zerubbabel: The name Zerubbabel consists of two parts. The second part of this name is obviously the same as the Hebrew word for Babel / Babylon. The origin of the first part is a bit of a mystery.
Insubordination is generally a punishable offense in hierarchical organizations which depend on people lower in the chain of command doing what they are expected to do.
Competence. There is an implied term that an employee will be reasonably competent to do his or her job. Incompetence will be a breach of contract and depending on the seriousness of the breach may result in an employer dismissing an employee.