i want it displayed the same as all the posts in a certain category are displayed, only that this time this alone will be displayed with the comments. I don't know if you understand, imagine that you click a category that has 5 posts listed under each other. When you click on one title you get in the single post view, with no sidebar (depending on how single.php is constructed). I want to use index.php as target for single posts and not single.php.
I don't know if it's possible without deleting the file , as i know that the hierarchy works like that. But some of the posts, that are large with large images would look better without sidebar so for those ones i want to display single posts in single.php.
Hope you understand anything :P