Ahh I know – so close to perfect.
The three suggestions are:
No reference to custom header was found in the theme.: This is because we have a custom header/logo option in the Customizer instead (much better).
No reference to custom background was found in the theme.: This option is handled by our Backgrounds add-on, which has WAY more functionality than the default WP background option. Although I might add this anyways for free users.
No reference to add_editor_style() was found in the theme.: I’ll be adding this shortly 🙂