Sure, no problem. <aside> is suppose to relate to the main page or to an <article>. The way I understand it the contents within the <aside> could be removed without reducing the meaning of the page or the <article> Like a pull quote or advertising.
But I bet it will be used for the columns on the right and left of the main section and I don't think that's what it's there for.
Evolution - The non-random survival of random variants.