How do I protect buyer and cooperate w on-site sales agents- Do they offer buyer incentives if they don't have representation?
IS onsite agent a dual agent if buyer does not have representation? Double Dip?

Not sure of your question. On site agents does not mean that a buyer can not have their own representation. What you need to ask is does the on-site brokerage co-operate with other agents. If so then just proceed. If not then you need to talk with the buyer to see if they are willing to compensate you via BA

Onsite agent is NOT dual agent if buyer doesn't have outside representation. Onsite agent is employed by the builder and represents the builder. The builder has written a purchase contract in its own best interest, and the onsite agent uses that contract. There's not necessarily a double dip, there is just a co-op that was built into the price that is now not used and put into the builder's profits.

A buyer's agent is to know where the buyer's needs and priorities lie and check to ensure the purchase contract and the entire process suits the buyer's needs and priorities and protects the buyer's interests. As far as incentives, etc, it is your job to find out all available and if none are available that suit your buyer, negotiate something that does.
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THANKS FOR RESPONSES