I'm not a Viva rider but as a frequent driver on Hwy 7 I'll have to say, too, that I've never seen any evidence of signal priority anywhere along the actual BRT. That includes the short single lane under the 404, where signal lights control just the bus traffic. If the lane is clear for the approaching bus, why does it still have to stop at the red light?
Also, at the intersections that have full BRT, I notice that a bus proceeds only if it have the transit signal (vertical white bar). It will not proceed on green because green includes regular traffic left hand turns, at least at minor intersections. I'd have to check again, but IIRC for Jane and 7 as one example, regular east and west traffic has a separate left turn signal. That means that the buses on the BRT can proceed on green, but they don't. It would be a very simple matter to include a white bar during the east-west green cycle, but the problem is that the vertical white bar actually means that buses can turn right or left as well as straight ahead, so having the white bar on the green would be illegal.
What this means is that there are at best only two brief periods during a full traffic signal cycle that a bus on the BRT will get a transit proceed signal. When you consider the Jane/7 intersection, that full cycle is at least 4 minutes long.
What transit priority signaling should do is exactly the same as what fire truck priority does, it cuts the green period short. And I've never seen that with BRT buses waiting at the intersections.