Looking at the skill description for Wally, he's limited to 4 friendlies. So for HBM/solo gorge, isn't ghoul still the best healer?
My Castle Clash heroes: https://www.reddit.com/user/mrjayviper/comments/7u6lno/my_castle_clash_heroes/
If you need healing, Ghoulem is still the better option most of the time.
HBM, Lava, IS, etc. They all prefer a GH over Walla for healing only. That doesn't mean you won't be using both.
iOS - DarkKnights