ARV is (after repair value) you stated the ARV was 75 then said potential market value of 128-150......I'm not positive but what i think you meant was purchase plus repair costs is 75?

I am positive most of your questions will already have been answered. 

They are both positive cash flowing properties. 

The amount of tax has no impact on the loan.   

The more cash you put down on the purchase, the more likely you are to have a positive cash flow each month.

If the cash flows are positive in either case (buying and not buying points), is the advantage of a lower interest rate really only observed after so many years of tenancy compared to not having bought points?

To max out my position and flip, I don't want to just hire him and pay him along the way.

You should only take debt on that will give you a positive cash flow immediately. 

If we find ourselves in the position, we will probably contact her BIC and request that those buyers be represented by a different agent. 

Performing, not performing, first or second position?