I suggested we look at the "home inspection " report. Interestingly enough, it doesn't mention a bathroom on the main floor. I keep wondering if there is a claim (beyond the costs of the flawed inspection where he misses the bathroom problems because he misses the bathroom).
This is the only item that I read that you can definitely have legal grounds for a lawsuit or compensation. If the inspector completely missed this bathroom, then that's obviously a serious flaw and an incomplete service. I don't know how much a court or arbitrator would award for something like this, it's out of my skill set!