If you have back rent, take the person to court and get a judgement and garnishment of wages. 

Personally, I put my money into stocks and also I lend money for flips mainly in the central Florida area.

I would let them know that you have documented proof that they screwed up, and if they won't waive the fees then you will make it your personal mission in life to leave a negative review (with proof) on any website that allows reviews. 

I personally don't see an advantage in requiring it.

I am in the DFW area and met them in person. 

(I haven't done this personally). 

A book I’m reading mentions “taxes” should be included in operating expenses but they don’t specify what type of taxes.All it says is “call your local county or look online at the county assessor’s page”No clue what that means, could someone clarify what taxes they’re referring to?

My contractor is great, referred by a fellow successful investor and also shared that, he himself stays away from Shaker for similar reasons (inspectors, process etc).

Is the squatter some random person or where they living there at one point and stopped paying rent? 

It's hugely trolly, weird, and borderline sociopathic.Healthy disagreements are fine in forums, but when you initiate the conversation, you can't later hide from it and make it like someone else started it when the entire dialogue is right above.A lot of this has to do with personal fragility and internet puffery.At one point, I invited two trolls to hop on a recorded (for everyone's sake) Zoom to discuss what they were up in arms about.