Yeah so he fills out his portion, you fill out yours, sign everything and send it to Mississauga. When Mississauga sends you an AOR (current wait time is 55 days) you'll get your UCI number and Application Number. When you send in the extra documents, you use these numbers to make sure they put it with your application. I would recommend waiting until you have received sponsorship approval, and send the additional documents (like your FBI check if you decide to send the application with a note saying you'll forward it when you receive it, and that you've been waiting a while to get it) to Ottawa, not Mississauga.