Libraries or HMVC

[eluser]alphasynaptic[/eluser]
So if I'm building an app with CI + Ajax where each page gets content from several different pages and places it onto the main page, should I use libraries despite the fact that I won't be reusing the functions or should I use an HMVC approach? I wish there was a simple way to load controllers from controllers but doesn't look like there is. I believe this isn't a problem of me not understanding the structure or capabilities of MVC but rather the fact that Ajax and MVC do not get along, I could be wrong though. Any help would be appreciated. Thanks in advance.