Limit post category display

We have a number of long guides that we broke up into a main landing post and section posts. The main posts all are assigned to the category GUIDES and are displayed as thumbnails in the sidebar using a Featured Posts plugin. Right now, the only ways visitors navigate to the section posts (categorized by a specific guide like Guide – Outdoor Furniture Brands) are through text links or a grid of post thumbnails and titles in the main landing page content.

Once they click through to a section post, there is a sidebar list of GUIDE SECTIONS. This is a YARPP widget that only displays related posts with the same specific guide category. However, I cannot seem to get the main landing post to display in that list without including addition guides (since a main landing post is categorized as both a GUIDE and a specific guide section).

How do I retain my ability to list the main posts in the Featured category GUIDES and include them in the GUIDE SECTIONS without showing extra Guide main posts?

The page I need help with: [log in to see the link]