I noticed that Adeku, the Isshu League Champion bears some serious resemblance to Buck and his brother Flint. All of them have red hair, sported clothes that have at least red on them, and this could well be possible following Lady Caitlin being the current Elite Four in Isshu and also Cynthia and Looker appearing in the game. If they introduced characters of the past and even changed Lady Caitlin from being a part of the Battle Frontier to being an Elite Four member, this theory could well be possible. Also, Buck's Japanese name is Baku, his name being similar to Adeku. What are your thoughts?