Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
If you referring this Easyblog demo site
http://easyblog.stackideas.com/ , you actually do not need to display Easyblog showcase module on the page, because the blog frontpage already have a build-in showcase slider if you have featured blog post, it will automatically show up if the setting 'show featured slider" is enabled.
If you would like to use Easyblog showcase module, perhaps you can try my following suggestion and see how it goes.
1. create each of your existing categories to hidden menu item (single category menu type)
2. Then edit this Easyblog showcase module from your site backend, assign to only show your blog listing menu item
3. so it will properly can display this showcase only blog listing page because those blog entry page already link to your single categories menu item instead of your blog listing menu item.