Question:
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We have 5 consecutively timed crontab jobs running at night.  Why did the
5th of my 5 jobs not execute?

Answer
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Perhaps the 5th job was dependent on the completion of the 4th job; thus,
your 4th job did not finish all its tasks when the 5th job's scheduled time
arrived.  For example, if the 4th job terminates by closing down the
database and the 5th job requires that the database be closed (for db
admin), then the 5th job will start and then abort.  This is because the
pre-requisite of the 5th job is not met.