I want to see if the experience of gender has an effect if explored by a similar study to the submission. For example: Do nonbinary people have the same brain development as the people in this study, or do they diverge from cisgendered people of the same sex?
Until they look at nonbinary and genderless people, we won't know whether sex or experience of gender is more significant in brain development. Even throwing in gender nonconforming people might produce some interesting findings.