They cannot reveal the name of the complainer for example against  another resident,Example: I complain to HOA that resident behind me is parking his vehicle on the street for more than 30 days...

If your search reveals you have a solid chain of title you should be ok with a Quit Claim and no insurance as long as you're totally comfortable with accepting the possibility that anything missed could come back to bite you and you could lose the parcels entirely with no recourse.

At some point I know I would have to reveal enough of the deal to make the potential partner comfortable to agree or not. 

The title search will reveal any liens or encumbrances on the property.

Each step you take reveals a new horizon.

I revealed more than I should have to the cash buyer, and when dealing with the seller, I didn't really know what to say (but he was a seasoned pro, and graciously guided me though the process).  

On my third post of The Science of Finding Deals, I will reveal how one can compete buying houses on the MLS.

You probably can't do anything about it but maybe some well placed questions about current events just in chatting while showing the property could reveal some of their world views.

If the bank would reveal the actual home damage with photos, we would not have so much competition,  As a plumber, I have gone to many homes where people have purchased their home "site unseen".

When acquiring real estate, your due diligence is considered a sunk cost if it reveals that the deal is not as sweet as it looked before.