When the Shadow Garden girls look so young in this spinoff, it's pretty hard to take them seriously. Not that this series should be taken seriously in the first place, but still. At least they are saving other kids, so they are peers for each other in that sense, making them more credible. If an adult got saved by kids and then told tall tales about secret organisations trying to resurrect demons from legends, it could be a bit much to swallow. Despite having been saved. In the main series when they are adults, so it's a bit different. Of course an adult can stil be a wacko and believe in all sorts of conspiracy theories, but those are a minority.