I believe the last upgrade that offers us a preview window of our army composition and spells, before attacking in clan war, can provide an interface for the heroes under upgrade to be used in clan war attack directly.
My idea is that that both heroes avatar would be visible on the preview window regardless of whether they are undergoing an upgrade or not, ofcourse when both are unlocked! That very window will keep an account of heal, or sleep, time of heroes, individually. Suppose I put my Barb King under upgrade before the preparation day, and queen is active. Now in the first war attack, king will be flagged green, but the queen's status depends on how much heal time is left, as per her last multiplayer raid, which would be displayed besides her avatar, on the preview window. If it's completed, she will be flagged green, otherwise red.
Now on my second attack, the preview window will not only keep an account of queen's heal time, but also king's, because he was used in the first war attack. When either of those have completed their respective heal time, they will be flagged green, otherwise red.
However, if I put my king under upgrade after a multiplayer raid, just before the battle day begins, or even during the battle day, the preview window will also keep an account of his heal time, along with the queen, which is not under upgrade at the moment.
In short, whenever we put our heroes under upgrade, the preview window will keep an account of their healing time, and will flag them green or red accordingly, but will allow both the heroes to be available for the war attack!!
I guess to finish the sleeping time of a hero under upgrade, an option to gem their time must also be given either on the preview window or his/her altar.
Let me know if you guys like this idea... Also would love to hear Supercell's opinion on it...
Or if you want to edit, modify this idea.... Comment below !!



