no I'm more wondering about why this works...if LabelStyle doesn't exist in QtQuick.Controls.Styles 1.0 :D 

anyway, about your question, we should have a Style file for each component, if possible. and within the component you have a Loader (iirc) which loads the style file, this is how it happens upstream

I have created the placeholders because the way QQC components are done, they'll look in the same folder all the times, i.e. if you're using QT_QUICK_CONTROLS_STYLE=Nemo they'll expect to find *all* style files in the same folder