Upgrade/replace troops in war castle
We have the ability to kick troops out of the war castle. Albeit you have to kick all of the troops for the one troop type/level and can't just kick a single troop, but that's not what this improvement request is for. Although that would be nice to be able to do that too.
What I'm asking for is the ability for clanmates be able to upgrade the level of troops that are in a war castle.
Let me give an example. If someone has a 15 spot castle and it is filled with lv3 archers, a clanmate that has not yet donated who has lv4 archers should be able to donate his archers and they would automatically replace 5 of the lower level Archer.
This would make it easier to load up the castles with the highest level troop.
You would only be able you level up the same troop that you were donating. Ie. Donating a lv6 wizard would only replace lower level wizards, not 4 lower level archers.