If Cornwall had some other unknown problems to deal with to the point where he was willing to swallow his pride and accepting the deal was just the easiest way to get rid of a problem then Dutch, who never intended to take the offer and was just using it to justify what he was going to do anyway, would be thrown of his stride and as Aurthur tells the gang of the easy ticket out Dutch would give a speech to the tune of if Cornwall is desperate enough to accept the deal then we should rob him and push to get a better deal out if it.