Voice of Isengard/Ring-Maker cycle theme question

By tnewman772, in Strategy and deck-building

We are just now getting to these quests in our household (we play with two players). We are attempting to play thematically, but we are having trouble figuring out who the designers were intending to go on these quests. We originally started in the Voice of Isengard quests with Eomer/Eowyn/Mablung and Aragorn/Erkenbrand/Imrahil. However, after the third quest in this series, the heroes winter in Isengard and Saruman says he knows they wish to return north to Rivendell where they have been assisting Gandalf, but he has other tasks for them. Why would Rohan heroes be based out of Rivendell? Also, according to the Tale of Years people, who have done some nice work laying out the dates and available characters for each quest ( https://drive.google.com/file/d/0B97EGklBluOnUWpxeFdjdHp1T1U/view ) , at the time these quests take place, Eowyn is about 5 years old and Eomer is 9. Well, that seems odd, unless they got the dates wrong? So then we switched to elf decks for the Ring-Maker cycle, but they do not really fit thematically either. Galadriel/Glorfindel/Legolas and Elrond/Celeborn/Haldir get captured by the hill men? Really? The Dunedain seem most fitting, but we don’t have those cards yet because we are doing the expansions in the order they were released. Looking at the player cards that came with the expansion, we received Rohan, ents, and Noldor/Silvan characters, which is why we chose the decks we have used so far. It just doesn't feel like it fits the theme, though, and it is troubling. We typically like to play through the whole cycle with the same heroes, but we still can’t figure out who would be on these quests who is not a child at this time and would be based in Rivendell while pursuing Gandalf’s machinations, as Saruman relates. Can anyone assist my understanding? What was the intent of the designers when they were writing these quests?