Yea, drop your building do all your allies are stripped for even easier money... Unless you drop the allies and bank it... Or use your troops to simply self pin and annoy enemy.
Hansel is very good in war, both system and off... To a build like me they are a pain. Fortunately for me, the majority of hansels are eb hansel so end up with a lvl3 t4 as their attack build. This is a 25b building so most people would be scared to tear it down in a war. The most efficient hansels I have come across are those that are constantly building and tearing down t1 builds to stay dtw whilst causing major damage
I used to be a decent sized attack build then converted to all guilds with 1 attack build which I can drop anytime, drop my allies, bank my gold and there you have it... Untouchable pure spy. My alt is also a hansel and does b2b haunts earning mega gold and he ain't even that big. Hansel is by far the better build
I was in a clan that does b2b ambush they have a bunch of hansels, they make awesome plunder yet again, an attack build can use more ally bonus so it can even up if big enough. But only big enough so hansel can be convenient for me but I'd get farmed.