Well i was thinking in the walls recently and the way we use to upgrade it. We can do it with gold and elixir but not with dark elixir. In my case i had the heroes at max level for my town Hall and my dark elixir troops the same but i doesnt want to upgrade the Th until i had my base at max with fully upgrade walls. But i started to loose the dark elixir i won because rigth now i doesnt have a way to use it. So if you could use your dark elixir to upgrade the walls and not only gold or elixir i think that like in my case you could upgrade the Th at full without losing the resources or needing to upgrade without having everything at max level only to not lose the dark elixir

