First things first, I don't want to come off as rude in any shape or form as that is not what I am trying to convey - but I do have to point out that it was somewhat hard to fully decipher what you were trying to suggest due to the way you formatted your suggestion text.
All in all an interesting suggestion once I deciphered it. However, I don't think that would be an ideal way of going about this as this just stimulates and adds to the currently existing dueling system which already does exist and that is the arena where you can duel. If you were to suggest that if the developers could make additional use of the castles for additional locations for the use of an arena, then I would be all for it.
In my personal opinion, I would much prefer to see the castles be used properly like in the single-player game itself - obviously, some mechanical limitations do exists so I understand that they might not be able to fully deliver a 1-to-1 replica of the mechanics. However, as far as I am aware, the developers are planning on making the castles the same way as in the single-player but for clans.
If you are looking to get the source of where I found this information, I will leave the link for you to read up on it yourself:
https://www.patreon.com/posts/roadmap-49363667
Nevertheless, here are my five cents on the matter and I hope some other members of the community would share their insights and opinions more on the forums rather than on just Discord.
