If they are going to break the lease, the longer you have them in there, the more likely you will have ongoing problems with them not paying rent on time, chasing them down for rent and getting more complaints.The fact that the professionals addressed the problem and said there is no ongoing issues, is going to make it hard to show negligence on your part. 

Because I'm sure it will be brought up, tax considerations seem negligible to me considering my tax bracket, my long term capital gain tax being 0%, etc.  

Their failure to inform you is negligent and should be shared with others.

Negligible. 

However, insurance is limited because it only protects you from one type of liability: accidents/negligence.

Cost will be nearly negligible and any added value will be helpful.

If he burns the house down and you had prior knowledge of his negligence, your going to be the responsible party. 

The previous owner's negligence caused a massive overgrowth and thus damage to the fencing.

Let's say my appreciation is negligible and I'm basically flat - the economy hits the skids and I'm up for my first five years or so and then down for 5 years and I'm selling into a recession so my appreciation is nil.

However, there's a separate issue for you to consider ... since that report wasn't performed in your name, you have no legal recourse against that inspector should they have missed something due to their own negligence.