Final answer:
Due to a mix-up in the provided information, the answer pertains to Wes Moore's insights from writing his book, which highlight the role of choice and environment in shaping individual destinies, despite the information being about Coates.
Step-by-step explanation:
The question seems to be mistakenly associating Wes Moore with Ta-Nehisi Coates, as the provided information primarily discusses Coates's works and experiences. Nevertheless, to address what Wes Moore said he gained from writing his book about his connection with the other Wes Moore, one could say that through his writing, he gained a deeper understanding of how small choices can determine one's path in life, the impact of socio-economic and cultural environments on individuals, and the importance of education and mentorship. By exploring the lives of two men with the same name but different fates, Wes Moore illuminated the powerful influences of society and personal decisions.