or the whole amount of debt they owe originally before the plan?

If you include lost rent, damages, etc., then yes, it is very expensive.

I'm exploring options and this seems like a good way for me to purchase the next deal but I'm treading lightly as using unsecure loans sounds pretty risky and of course I need to consider ALL things including their terms, market conditions, capital on hand (about 30k to invest) and my strategy which is to BRRR. 

It is still the seller's debt and it remains their responsibility.

It should be included in the docs somewhere. 

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases.

Cleaners - we paid them a contract price per clean, which included labor for laundry and materials for cleaning (clorox/windex/floor cleaner etc.).

cost me 400 bucks including buying the water heater. 

Hey @Christopher Eduardo, Please talk with a tax lawyer to make your final decision, but in general: In a Chapter 13 bankruptcy, a debtor creates a repayment plan to gradually pay off their debts over a specified period, usually three to five years.

It's a fantastic strategy to pay down debt.Assemble a team of professionals, including a real estate agent, mortgage broker, and possibly a property manager.