Because the message conflict is reflected both in the big picture and in the small picture, success or failure in a the attempt to achieve the goal is dependent on whether or not the Main Character is able to overcome his or her personal demons, often through a leap of faith just before the climax. So, to be dramatically strong a story must explore an the problem both objectively and subjectively, weigh one side of the conflict against the other, and then show the final result of choosing one side over the other.
Would it not have been more dramatically pleasing to have his experiences with the children teach him how chaos is not just a disruptive element, but sometimes an essential component of life? And would it not make sense for someone who has spent his whole life imagining the way dinosaurs lived to be surprised by the truth when he sees them in person?