You are thinking too hard. You are over complicating something so simple it is making my head hurt too. So let's figure it out together. Does your site structure really matter? First thing first, how you set up a site. You here words tossed around a LOT. 'Silo Structure' ; 'Pillar Articles' ; 'Child Pages' and so on. I want to break this all down super simple for everyone: K.I.S.S. KISS, or Keep It Simple, Stupid. Is an acronym. I normally would not be as colorful with my language but I do have a point we will eventually get to. Why KISS? Visitors and Search Engines prefer things in a neat and organized manor. You do not need to think long or hard about this topic. Just think of what would a user like when navigating your site. This is where a 'Silo' structure makes perfect sense. User visits my website about 'Hats'. I did some kick butt Key Word research and have a few dozen long tail Key Words to throw up. This is where KISS comes into play. Would a USER prefer all the articles thrown up onto a rolling blog? No. Not a chance. If I got to a hat site and I only wear 'Cowboy Hats', I do not want to skim through 10 pages of 'Baseball Cap' and 'Flat Brim Hat' articles to find some information on my lovely ten gallon variety. So we can easily grasp that users will prefer structure and order. Like things grouped together. Now Search Engines? The wonderful bots visit your website and find a bunch of long tail articles on 'Hats' and different types of 'Hats'. Google gets that. Cool. But Google can't decide if you site is about 'Cowboy Hats' or 'Baseball Caps'. Why? You have five long tail key word articles on each. You want to help Google figure out where to rank your site, right? So you group the like pages together. This is what a Silo is. You just group the like things together. Users like this. Google likes this. Keep It Simple. To take this a step further, when you lump all of your articles together, Google and your User may want to learn more about this 'Flat Brim Hat' you talk so much about. The user can't find a great article on it from your site because you are targeting all of the small search volume key words. Google sees all of you posts in the category about 'Flat Brim Hats' but since your category page has no content except links to your inner pages, Google decides your site does not deserve to rank for 'Flat Brim Hats'. So what do you do? You can accept Google is not nice and the User can just find content somewhere else. But that is a waste of traffic and makes your visitor think your site is NOT a complete reference. Most likely they will not come back. Or, you give the User something to read about 'Flat Brim Hats' and Google a nice piece of content. Throw up a few thousand words about 'Flat Brim Hats' and now the user who wants to know more about this new crazy flat hat and now Google knows that you deserve to rank for that Key Word. it is a win - win. Do not over think site structure. Just put up a site and make it easy for users and search engines to crawl. The more you think about what a parent page vs a child page, or category page vs pillar page, etc, the worse off you will be. When it comes down to it, it is your job to make your site as user friendly as possible for your human and robot visitors alike.