I'm wondering, after four months have passed since the previous agreement & contract expiration's, if the Buyer approaches me again without the agent being involved, and if I sell the house to them - do you think that I'm still bound to pay that former agent a commission?

If it were to have happened with your 5th you’d probably hate it but ultimately shrug your shoulders and think “well, it was bound to happen”.

They'll be bound to that lease during those months, and then just by virtue of them expiring, March 1 will become month to month again.

If they are friendly with you, perhaps they 'accidentally' loose their collars before they arrive.

@Sean YangGentlemen, please allow me to tie up some loose ends from the discussion above.

These are all things to consider or it could be loosing money.  

How do I handle bringing in possible partners without loosing the deal

I have seen several people fail or end up with a s**t deal, which typically results in loosing some of your capital, huge frustration and the end of your real estate career. 

I have been in the area for over four years now, and do have a loose network.In the end, I look forward to working and helping others.

@Johnny Soriano It will also have to pass an FHA appraisal - not just for the amount of the loan, but also for safety.That means no peeling paint, loose hand rails, broken windows, crumbling cement steps, etc.Those require a construction loan (FHA 203K) or Fannie Mae Homestyle.