Creativity is not rational because it is not bound by rules or norms. The idea that there is a relationship between creativity and intelligence simply means that the latter subsumes the former. It does NOT mean that intelligence as such is not bound by rules or norms. Creative behaviors are easily classified as intelligent when they work. Creative behaviors that are merely surprising but that lead nowhere have little appeal as demonstrations of intelligence.
Some students find creative ways of cheating on exams.
Those who are caught did not, by definition, act intelligently. Those who are not caught remain anonymous and their genius goes unrecognized. All of these address the ability of the mental apparatus to operate rapidly and efficiently. What this DOES mean, however, is that because of the breadth and slipperiness of intelligence as a construct, little progress is made by ruling in or ruling out certain aspects of human performance merely because they can or cannot be held up against formal norms. Attitudes, self-esteem, and stereotypes.