Broker" means an individual, partnership, limited liability company, corporation, or registered limited liability partnership other than a real estate salesperson or leasing agent who for another and for compensation, or with the intention or expectation of receiving compensation, either directly or indirectly: (1) Sells, exchanges, purchases, rents, or leases real estate. (2) Offers to sell, exchange, purchase, rent, or lease real estate. (3) Negotiates, offers, attempts, or agrees to negotiate the sale, exchange, purchase, rental, or leasing of real estate. (4) Lists, offers, attempts, or agrees to list real estate for sale, lease, or exchange. (5) Buys, sells, offers to buy or sell, or otherwise deals in options on real estate or improvements thereon. (6) Supervises the collection, offer, attempt, or agreement to collect rent for the use of real estate. (7) Advertises or represents himself or herself as being engaged in the business of buying, selling, exchanging, renting, or leasing real estate. (8) Assists or directs in procuring or referring of prospects, intended to result in the sale, exchange, lease, or rental of real estate. (9) Assists or directs in the negotiation of any transaction intended to result in the sale, exchange, lease, or rental of real estate. (10) Opens real estate to the public for marketing purposes. (11) Sells, leases, or offers for sale or lease real estate at auction. 

So, you have a plan in place but "buyer" has made an offer which would interfere with your plan.If you agree and they perform, upside is you don't lay out fix up cash and your time supervising project.If they don't perform, you've lost 30-60 days holding costs, risk of a market change, or interest rate increase, etc.Put them on the "waiting list" and notify them not to enter project until invited, which should be after competition or never. 

Being an experienced investor and knowledgeable about the business ; I want to give up as little comission as possible as I will require less training ; less broker supervision ; etc.Thanks in advance :)

Have you consulted with your supervising broker?  

You broker "holds" your license because a broker is needed to supervise agents.

I was supervising the under house work skiinny teenager goes under there..

You should supervise the property managers especially when just starting to work with them so you can ensure they are managing the property to your standards. 

That has been a big part of the delay, his guys are wasting time and materials on the job with out his supervision.

He did not supervise his workers.

And I also supervised employee remotely.