How we could use upgrading heroes
I know you're probably thinking 'not another one of these threads', but I've had this idea which I haven't seen mentioned before, but if it has, or the idea is rubbish, just let this thread die.
Anyway, most folks biggest issue is using upgrading heroes in war, often it can make a big difference sometimes between a 2 star and a loss.
So, how about pausing upgrading heroes? When paused you can use your hero to attack in multiplayer, in war etc. However, it is not able to defend if you go offline. Upgrades can only be resumed when the heroes have healed, and have to be done so manually (so extra potential for people to gem their heroes to heal).
This would mean people would only use it sparingly, and I can't see how in any way this can be exploited. However it solves the issue of heroes being usable in wars.
As I said, if this is a unique and good idea, please support it, if not, let the thread die.