They are split to signify between Original Series (Kanto, Orange Islands, Johto), Advance Generation (Hoenn & Battle Frontier), Diamond and Pearl (Sinnoh), Black and White aka Best Wishes (Unova). Also not sure what you mean by them not dealing with the current on going episodes since they have Roughneck Dragonite episode up which is the last episode title to be revealed in Japan. Unless there is something I am missing and I didn't understand what you were getting at.