Ah gotcha!
Yes, my concern is more for after the AOR, as for the last three years prior to applying we'd always just say he was visiting even and never had a return ticket and it was never a problem coming in and out from US, they literally asked no questions... my concern is once we receive AOR, what information does CBSA have, or would we be able to just continue to travel and say he was visiting or would they be made aware that there is an application.. I assume maybe there would be more questions with the OWP being in his passport as well? This seems to be a tough one to figure out as I don't think many people take the risk of traveling during the application process!