>>6160836True, but I think they did that to make it harder for the Ajin.
Another kewl fact about them is that they always regenerate from the largest chunk of flesh available, no matter what that is or where it is. This has been abused by someone intentionally chopping off their flesh, storing it somewhere
or sending it to a highly secure location that's otherwise impossible to infiltrate, and arranging for their body to turn into soup when they die as a form of fast travel.