She did not have a lease agreement however so I am implementing mine tonight with the tenant.

There account manager is through Fidelity and they aren't offering any matching at this time (but in the process of implementing it soon).

Based on the changes each organization has implemented over the years: 1) how might an investor stay current on Fannie Mae and Freddie Mac lending criteria; and 2) other than referrals, what are some ways to locate knowledgeable and investor-friendly lenders?

Honestly, I am not very good at follow up because I guess I get enough leads and turn them into deals but this is something my operations President - @John Matthews is implementing now to see how much higher we can push our conversion numbers up.

Secured loans are fine, provided your DTI can take the hit. 2nd mortgages are the most common implementation of this loophole: "It's NOT a gift, it's a second mortgage on ANOTHER property I own, secured with a formal note and deed of trust recorded at the county, at 3%, interest only, with a balloon payment due in 30 years.

This is actually the same basic strategy that I plan on implementing. 

-If you were to meet with a prospective borrower who is interested in using your money to implement the BRRRR strategy what information do you want from them?

Implement what I call a "Zero Bull$h*t Tolerance", and tell people that upfront in the nicest way possible.  

During the pandemic, there have been SO many cities implementing new laws to restrict Airbnb's.

Implement!!!!!