To the OP, first, I think you are awesome for taking the effort writing this with the intention of helping others out.Please do not be offended when I explain why I don't agree, and see this as follows.

Obviously the credit run has shown up on my FL closing process but easy to explain, other than that, at what phase of the purchase process (on the NC home) will it start to affect my FL purchase?

You can never STOP a human being from damaging property, but clauses in your contract/lease can explain how it will be dealt with if damage occurs.

Can anyone explain briefly how one can expand beyond that 10 mortgage limit to reach goals such as 50-100 doors without giving up any of the single family homes already invested in? 

We listen and study a lot but are scared of the Shiny object syndrome that David and Brandon often reference.

They could do a better job explaining themselves.

It explains the importance of creating your core four.

This efficiency of market explains why there is a poor relationship between initial cash flow and cash flow over a long hold period. 

I have an objective score sheet.

My agent explained to me that if it appraises less than what I offer, then I am to pay the difference outside of financing.