Hmmmm - not so sure. But - there are a number of other videos of Crooks on the roof, wouldn't a second person appear on them? Not seen any showing a second person.
I think you're right, based on
This new video. They start at 6:08:30. One person pops up on the roof at 6:08:36pm, moves towards the left as you look at the screen. The timing and the speed he is walking fit pretty well with it being the person seen briefly on the other cop cam at 6:08:45, although by this point he isn't visible on the new video. The object Jeff thought was the shooter I think must be be a chimney or another telegraph pole in the distance.