That's precisely what he's doing. When buyer shows up, all the F&I bases are covered**- because you've provided all needed credit info.They are probably setting you up for financing. The dealers make a significant profit when they sell you their finance plan. This way they can run a TRW on you and be ready to go with the full court press when you are handed over to the guy selling credit life, disability,rustproofing,paint glaze, etc..... It's a profit thing.
The easiest way for a cash sale is to provide a certified cashier's check from your major financial institution and complete the sale during normal business hours. Dealership calls bank** confirms validity of check** and off ya go. I've done it here in CA with no issues whatsoever.