The application is mainly about the immigrant, from the moment they really start to process, they have a look at who the sponsor is. (That's when you also get a Client ID#.) This is why the sponsor's "reception" date is different from the applicant's reception date. (At least, as far as I know.)
Yes, I know that. But it is impossible that the permanent residence application was received at the visa office BEFORE the sponsorship application was received in Mississauga.