I locked a DSCR loan yesterday at 6.385%, 75% LTV.  

Well its just like in our business when we make a loan and the borrower stops paying we deal with it..

Think of this;  if the buyer can't qualify for a bank loan,,,, why the heck should you stick your head into a note and mortgate noose??   

. - New construction will be comped against other new construction - Start out with enough comps to justify the price point- keep the area tight to consolidate the risk vs building one or two in different parts of the same neighborhood. 

Will he and potential buyer of the property be subject to Commercial financing or will the property still qualify for residential 4 unit and under loan types/primary?

DSCR loans are not that low and regular hard money loans will be in the double digits.

I look to purchase first property with in the next 2 months with VA loan.

They asked me to empty my savings, max out cards and then finally to take out a loan.

In our commercial loans we still had 1 to 2 years on our 5 year balloon periods.  

Pretty common, you can definitely use commission as down payment conventional loans and not have it count toward IPC as long as you're on the loan.