What link do you have that suggests that Newman is more than 50-50 for this game?
The only way this can be put to rest is for Newman to step in and play as if he isn't injured. If that is true, the optimism is founded somewhat.
The predominant line of thinking, right or wrong, is that Newman will eventually not be able to perform at a high level. So, your third cornerback makes an impact whether you like it or not, want to deny it will happen or not.
Anyone who is logical can see the issues that would cause. That same logical mind would be able to take the totality of what Reeves has shown to date and realize he is not head and shoulders above Glenn, not in experience or playmaking ability. He is a veteran at a position where it actually does pay to have seen it all. I saw nothing from the player in preseason that showed he lost a step he never had. I did see Reeves make some awful mistakes that would get many players cut, not promoted.
) beyond a shadow-of-a-doubt how badly Henry has played since he became a Cowboy. 
