yeah but they know its a "0" return so its not a big deal, they are in contact with Canada revenue agency, and you are right it is to figure out the situation of the sponsor, other wise why wasnt the RQ in the sponsorship package? everyone fills it and sends it in at the beginning, obviously they want to asses the situation and see if address, employment, travel history has changed or not, thats why its not a good idea to send them something they didnt ask for, it looks suspicious !