I'm not sure what law are in your state so can't comment on whether failure to pay the deposit is sufficient grounds for eviction but I would suspect it's not.

First: Define “good.”Second: Why would any owner want to leave money on the table, especially money sufficient enough to make a market deal a “good” deal for the buyer?

The sellers interest is the interest and transactional convenience, when a lender is involved there are costs associated that can often be rolled back into the loan provided the loan to value (LTV) based off the appraisal is sufficient. - Higher rates.

The main thing is to have sufficient reserves because stuff will go wrong in a house like that and it’s typically more costly than a newer home.

The signed lease is sufficient as a legally binding contract, confirming their acceptance of the new rent amount.

In addition, the owner of the home must not own more than three single-family homes.3) They are unable to provide sufficient documentation, such as the emotional support animal letter, that verifies the ESA is necessary for their health and well-being.4) The tenant provides fraudulent documentation attesting to their need for an emotional support animal (usually a fake emotional support animal letter).5) The landlord can demonstrate that making accommodations for an ESA would impose undue financial burden or logistical burden. 6) The animal is destructive to the property or displays threatening behaviors that could put other tenants or yourself at risk.7) The size or nature of the animal makes it impossible to house safely or humanely.

Given how good the terms are, I'm surprised to read that they will work with someone that had a bankruptcy or foreclosure more than 3 years ago with a sufficiently compelling letter of explanation along with supporting documentation. 

Anyone in OUR situation (who is not in the 1% of 1% and has dividend / investment income that would provide a sufficient means of living otherwise) is going to be totally focused on cash-flow.  

My opinion reviews your financial situation first because jumping into real estate or real estate investment you will need at least six months of reserves financially self-sufficient to support yourself.

Effectively buying at 100% CLT with a 1st position portfolio or DSCR loan combined with a seller 2nd that the lender wouldn't otherwise approve....It sounds like this is a recipe for getting sued at best, and arrested if it rose to a sufficiently large scale where charges were brought against someone.