I never claimed otherwise. You have invented your own strawman to attack.
To restate your argument: openness is correlated to creativity (not controversial) and being neurotic dampens that because you care a lot what people think (no evidence).
There is no correlation between neuroticism and creativity. Neuroticism doesn't effect openness so it makes no sense. Either your argument is that neuroticism influences openness and that influences creativity or your argument is I just think neuroticism makes you less creative because I just think so. You might as well not even mention the Big 5 because it doesn't effect your last point.
In order to better understand what neuroticism really is and how it really works I suggest reading about the amygdala, gaba, fear impressions, and looping. The less a person is so restricted the more free they are to universally experiment, consider alternatives, and act. That is generally how people perceive creativity.
