1) not true if you have good hogs (lv 3-5) it takes 2 (unless the giant bomb is lv 4 only takes 1 on lv 3 hogs)
2) in all raids I have seen with hound study haven't been effective, bury your ADs and you'll have them down before the loons get there.
3) at TH10? By then all your walls should be already lv 7, I'd like this back aswell, but I understand the consequences of doing so.

