As was stated, people can sue anyone, for anything, anymore. Whether it carries any water is the question.
Can you please respond and be more specific about what problems were missed? The inspector I use, who is absolutely fantastic, makes it very clear they can not inspect on that which they can not see (i.e. what is in-between the walls).
We would be curious to hear more about the specifics on what it was that cost $10,000...... more