Let's just say all things are equal among the 3 QB's. If this is the case then Vick became your QB the day they put that C on his jersey.
This is no slam on Vick but it I believe it would give him the extra edge from a coaches selection point. This is why I would have held off on awarding that last captain spot. I firmly believe it sent a strong message to the other QB's competing for that spot.......
I agree that if all things are equal on the field, Vick's leadership ability will give him the start. On the other hand, I don't buy into the notion that Captains will always start. For example, I expect Tim Edmond to play this year, but I don't expect him to start. I think that despite Tim being a Captain, all the other running back believe that if they play well, they can earn the starting spot. Similarly, I think Windham and Sprague both believe that if they win the job on the field, they can be the starter.
Let's see how the scrimmage goes, and then worry about this question. As well as the defense is playing, it's going to be a tough environment for QBs.