And if this becomes commonplace what defensive measure could we the investors make?

And, doing it with an engineering-based study (IRS' preferred methodology) with audit defense included, is going to be even more important.

Press on the brakes with rates to get inflation under control, unit supply shortages, as well as others, induce a defensive mechanism working in reverse action to rate deployments, inducing a compression effect vs receding action.

What is their defense? 

I haven't listened to them, so I have no idea the content, but it looks like he did ok for himself.http://investfloridashow.com/ep-56-karma-senge-tri...http://www.kevinbupp.com/ep-45-how-this-self-defense-instructor-went-from-zero-to-318-multi-family-units-in-less-than-6-months-with-karma-senge/

5) Is there an audit defense built into the deal?

As a landlord I believe it should be your goal to establish good relationships with tenants, so use positive approaches versus being defensive during communication. 

So many landlords get all defensive, "Oh hell no!"

I don't need anyone to speak for me, to jump to my defense, or co-sign anything I say. 

It appears that you are getting defensive when people are merely attempting to explain things that you really need to know.