There is no logic with cic ..
My friend has landed today and we celebrated the event.
I sent my full application on November 16, 2016, from the same post office used by my friend. In fact, we lined up and paid in the same cashier. So I assume that both application delivered in same day. The AOR was 2 days different.
My application is almost identical to my friend; we have graduated from the same program, same University, same NOC.
So my advice is that no need to waste time trying to understand how they sorts things out.