Should admin_theme_init() be calling init_theme()?

Had a case where $custom_theme got reset before init_theme() was called.
This patch:

--- a/admin_theme/admin_theme.module
+++ b/admin_theme/admin_theme.module
@@ -166,6 +166,7 @@ function admin_theme_init() {
     global $custom_theme;
     $custom_theme = variable_get('admin_theme', '0');
     drupal_add_css(drupal_get_path('module', 'system') .'/admin.css', 'module');
+    init_theme();
   }
 }

solved that problem for me. Not sure still what caused that failure still for my particular case so just wanted to put it out there for review.