You seem to be making a great many assumptions in your effort to deny the validity of a study you haven’t read. The paper will be published in the Journal of Pediatrics - publish monthly since 1932, and for 2012 it had an impact factor of about 4.04, making it 4th for pediatrics.
There is no way to legitimately control for these factors, and it is ridiculous to think that they can. So, yeah, color me a little bit skeptical when someone claims that there is a serious relationship between drinking soda and being aggressive. Can't wait to see what the correlation factor is. I'm sure we'll soon learn why it wasn't made available to the press with their pre-release. The public is easily led by this kind of information, which is why there is so much money available to these people. The world is awash in junk science, and it is the pursuit of grant money that is responsible. That these publications support this practice serves as more evidence of just how far we've fallen.