User blog comment:IamJakuhoRaikoben/Chapter 456: Order, Review./@comment-24102956-20151013095648/@comment-25111584-20151013182304

Buildings normally have a foundation, y'know. They aren't just built on the ground. Then there's plumbing and whatnot. Shrinking a building should leave all sort of ripped stuff, not just a patch of soil. Plus, there's still the no-whirlpool thing when the island was shrunk.

Anyway, Brandish herself stated that the Empire would win if she shrank Magnolia.