This has been resolved, the issue is that the action('the_content_rss', and action('the_excerpt_rss', does not actually work as intended, sure it works for RSS2 feeds, but not the old rss or atom, so the image wasnt displaying properly to only some people and readers that went to grab the image with old methods.
The resolve is changing the actions to action('the_content', and action('the_excerpt' with an if (is_feed()) check to add the comic to the post's content, which of course is used on all of them.
- Phil
