I've had projects like this where it went fine for a while, was almost done and then we get into some disagreement and then I fire them on the spot and just pull someone else in to finish.

I say this because we used a different realtor to purchase our STR and it was a disaster all around - both our agent and the seller's agent didn't know what they were doing, had no worthwhile advice to offer, messed up paperwork so that it had to be done again, just a sloppy experience all around.

Could someone else make it work closer to their list price?

Might as well be paying your own mortgage rather than someone's else's. 

DSCR loans look at nothing else beyond the DSCR, credit, and in some cases whether or not you own another property.

The $40k number may have to do with something else!

Any landlord that thinks a tenant owes him something can file a collection and mess up their credit?

I thought about buying a non developed lot in cash, subdividing it, clean it (take out trees and bushes), get permits, and start building 1 property sell it and then build the second one...The problem is that I am afraid of going this route because of messing with sewer, water, electricity...

I may be wrong in my understanding of the real estate code of ethics outlined in the Arizona state statutes, and everything else I've read regarding real estate transactions, but as far as I understand it the original agreement to sell is null and void due to the nondiscolure committed by the real estate agent/broker first in the fact that he signed the agreement to sell as the buyer, misrepresentating himself as the agent and stating he had a buyer/investor and Secondly because the agent involved should not sign in representation of the buyer but may only accompany the buyer to the signing (it was done through docusign, I signed first and then was notified that the buyer had signed and downloaded a copy, I didn't look at who the buyer was until just last night).

Focus on boosting your search rankings with targeted SEO, and then bid out everyone else to dominate the ad space.