I agree it could've been another buyer, but, I also think my offer was below the "instant buy" option, which I believe triggered the reaction. I find it a miraculous coincidence that a great deal was made to a contract that had been sitting awhile, and within seconds of making a great deal, a full price offer came in. Of course it could happen, but I think the probability is highly unlikely. Either way, it is what it is, and I will never use that broker again.