I have held a small'ish position in ALDX for about a year and keep an eye.
My (educated layman's) view on the science is positive. With regards to your question, I think the quote below from the latest investor's call sounds objectively confident.
The 0.1% arm is meant as a control against the statistically SUPERIOR 0.5% dose. Since the response was higher than anticipated with 0.5%, and presumably with a dose response curve being available, I think it is reasonable to expect to see a statistically significant response also at 0.1%.