Mexican flag is full of national symbolism. The green strip represents the Independence Movement. The white stripe represents the purity of the Catholic faith. The red stripe represents the Spaniards that joined in the quest for Independence and the blood of the national heroes. The emblem-shield symbolizes the Aztec heritage.
Throughout skyrim you will go to the Riften fishery and see a woman (Argonian) - No hair. She will say she might lose her job due to a Skooma addiction and needs a Cure Desease potion, once she had this a Goal will come up saying Find out the source of the Skooma.
After the quest was Alduin's Wall was finished Delphine and Esbern stayed in Sky Haven Temple for as long as I stayed there. When I talked to Delphine immediatly after the quest I was able to start the quest Rebuilding the Blades. After I left Sky Haven Temple and returned I found out that Delphine and Esbern had left. Delphine went back to the Sleeping Giant Inn and Esbern went back to his place in the Ratway.