I have secured lines of credit on each property in case I need to pull cash quickly to take advantage of an investment opportunity.  

If you are confident something shady is happening, you can file a complaint with TREC. https://www.trec.texas.gov/public/how-file-complai...It has to be written - TREC will follow up with them and it will stay on their record.

Public records and publicly recorded leans looked clean on this one and his claims of title being clear and prepared seemed to align with some quit claims filed last year moving ownership to just his name from a multi-partner situation.

I filed a protest with the HCTO (on my own, through their automatic protest filing service--did not retain one of the many lawyers who yearly send solicitations to do this on my behalf).

If the Buyer records his/her contract against the property, and later either defaults and/or decides not to pursue the option, then you still have the cloud on title until the Buyer provides you with a release or you file a lawsuit to clear up title. 

After I read BK filing by Original owner I noted modification of original first mortgage 6 years after "recorded quitclaim deed" to another party who had not assumed the loan nor notified first mortgage lender of transfer of ownership.

My intent is to target military people specifically who are a little higher rank, who possess a security clearance, and who are specifically here for a short term lease for school.

I have until 4:00 today (before next guest check in) to file the resolution. 

He filed a complaint with HA/VRBO (this was the only good experience about this guest as HA/VRBO had my back) and then posted a 1-star negative review. 

In which case the owner has to file for eviction and start that road.