I'm working on redesigning our website. One of the content types has a main archive page (/success-stories) containing all of the success stories (written by graduates of our program). Because we plan to have success stories for other people (non-graduates), I'm using category hierarchies (/success-stories/graduates and success-stories/nonprofits, for example). It will go one level deeper to organize graduates by graduation year (/success-stories/graduates/%year%).
I think this will work out well. However, we won't have non-graduate success stories for a little while, probably at least a few weeks, which means that /success-stories and /.../graduates indices will contain the same content for a while.
So my question is this: Will it hurt to use a canonical tag that points to /success-stories/graduates as the authority until the main archive page contains more than just graduates? Or would it be better to use a 302 redirect from /success-stories to /.../graduates until more diverse content is added?