You SHOULD, if for no other reason than that most people who make the move you're making are looking for a reduction in (some) liability in some way, and the fact that you mention "fees and some other factors."   

@Richard Appleby All but universally banks will not credit that owner financing as you down payment requirement, they will simply credit as a reduction of purchase price, there in slightly decreasing your down payment requirement AND that payment add's to the calculations on that side for viability. 

As you likely know, sellers typically pay the commissions so to save yourself some money, find someone who is willing to take a reduction in the sales commission by you signing a buyer's agreement for your investment properties (where the commission is then covered by the seller). 

If it was a job loss or reduction, I can see that people would just sell out because they just can't afford it anymore.Another issue is whether or not the Price Drops will be REAL or NOMINAL.

Depending on the version, the RPA may have imposed a continuing duty of disclosure on the seller throughout the transaction.If issues were disclosed to you during the transaction or if your property inspector reported these items to you, then the issues were disclosed or made known to you during the transaction when you could have negotiated a price reduction or credit or cancelled the transaction. 

They also like to see some principal reduction. 

If the weight of these loans puts a bearing on your shoulders, then pay them off ASAP.

If it was within the last 6 months, and it is still within a similar condition, then your own purchase would be the comp with the highest weight given in the appraisal.

Having said that, partnership agreements generally carry great weight.

I would definitely be looking for price reductions from the seller if the original price of the house didn't reflect the upgrades needed.