I was in G&T throughout grade school, anyway, since I was among the top students in math. My learning disability was unidentified until adulthood, unfortunately.
Now, as a middle aged adult, I'm broken, homeless, and destitute, socially and reputationally ruined, and a bit beyond the level of youthful neuroplasticity needed to engage in meaningful continued education, contemplating suicide day in and day out for years and decades on end. It's a miracle I'm still here.
The takeaway here is to take to heart the idea that such early disparities are indicative of a learning disability. Please address the child's disability concurrent to nurturing the child's talent.