The Messi-Yamal photo story comes from a charity calendar shoot connected to UNICEF, when Messi was a young Barcelona star and Yamal was still a baby. The image resurfaced because the final now gives that old picture a strange symmetry: one player became the defining figure of his era, and the other arrives as Spain's new left-footed attacking reference.
It is a useful way into the final, but it should not flatten the football. Messi and Yamal will not spend the match marking each other. They will influence different zones, pull different defensive reactions and ask different questions of two teams that reached the final in very different ways.