Some damage from WDI, which seller will have to address this before close.Seller is paying all closing costs, survey & title, they did a rate buy down to 5.49%, and a year warranty. 

Houses that sustained fire events have long term consequences including structural damage and mold that results from water intrusion required to extinguish the fire.

They're still trying to scam people wouldn't that help to keep the damage to a minimum?

In response, I had a plumber and a water restoration company come to assess the situation.The restoration company cut into the drywall, and the plumber thoroughly inspected all the pipes, performed a leak test, and conducted a pressure test.

To me the biggest issue with out of state investing and long term rentals is that you have to deal with property damages and/or evictions. 

Often times when a builder/buyer moves too fast, or is too busy and overlooks a key piece of due diligence, the unethical ones will try the "scorched earth" method and blame everyone but themselves, even when they know it was their own mistake, and they'll see if they can scare you, the seller, the title company et al into paying damages/fixing their problem. 

Long term I think you end up losing your shirt here, so if you can get out without too much damage I'd take my lumps and move on.

I would imagine the best actions would be to immediately fire the management company, pass the keys onto a new one, sue the old one in small claims court for the listed damages.

What steps would you recommend to minimize damages and resolve this issue efficiently?

Especially if seller just received a windfall from the sale it is definitely worth suing for damages.