Gee, timing is everything.
I went out for a long circular walk - past east side Radisson, down Portage, past MTS, CityPlace, Rogers and Hydro from about 9:50 to 10:20 and didn't see any of what you folks saw and I was searching.
But in the last ten minutes (10:10 to 10:20) I stood at northeast corner of Convention Centre and watched somebody circling the Delta Hotel. Lazily circling up and circling down. Lots of colour, so at first I thought it might be one of the kids, but quite accomplished-seeming and relaxed flying, so I don't know who it was for sure. But I suspect that's number 5 of 6 accounted for if Mother Hen saw the others at about that time.