Obtain the services a competent attorney who specializes in evictions.If the tenant is in a local jail, you may be able to get him to sign a formal notice for him to end tenancy by mutual agreement, but you will still be dealing with his possessions.

I'd be more concerned with them thinking you're buying and moving out allowing you to take possession.

Lots of folks want to help others on this site, but not all possess the same ability to do so intelligently.

You're afriad now that maybe people have been checking the house out with the idea of stealing all your possessions or something.

I read in the Cat-Litter-House thread provided by Chris Vail about a "Release of Possession" for all of the stuff on and in the property.

It would be difficult to value a property for ARV if not innately knowledgable about the marketplace/neighborhood.When those who are experienced in buying properties in areas they don't possess such knowledge of they will locate people/professional who are knowledgable in the marketplace.Now going back to your original question, you are experiencing different interpretations of the variables in the sale comps (assuming they are actual sales) and its here where you as a real estate investor earn your money. 

Also, under #2, if tenant pays half of August rent during the complaint/summons process, does that mean I cannot retake possession of the property and must start the eviction process all over again for September rent?

If you simply hold onto the property for ten years after the tax deed date, and maintain possession (usually by renting it out) then you are into old fashioned "color of title adverse possession" which is 10 years. 

Here is just one "legal dictionairy" defination article.http://legal-dictionary.thefreedictionary.com/wasteIt begins Harmful or destructive use of real property by one in rightful possession of the property.I will attempt to find you examples.

We also conduct our own walkthrough prior to the tenant taking possession and then ask the tenants to conduct their own video walkthrough once they've taken possession.