Words like "if" and "could" do not enhance the quality and/or persuasiveness of the evidence being presented.
But as we are speculating, if Roberts was sitting on the couch she would have seen Oswald's backside as he walked towards the front door. The light coming into the living room would only make it more difficult for her to see if he was wearing a dark shirt or a jacket. Just have a look at the girl coming into the room in the first video at about 0.19 sec. How would she have looked to somebody with poor eye sight?
The evidence I am pointing out is the silhouettes shown in the video. It doesn’t need any enhancing or require any additional persuasiveness. It is there for all to see with their own eyes.
The naysayers have already poo poo’d the statements I presented earlier by Hugh Aynesworth regarding Roberts sitting watching TV. So there was no need to repeat that when replying to your post.
We can all see the girl coming through the front door. And tell basically what she is wearing. Regardless of the fact that it is a poor quality video. It would be difficult to say what Roberts was able to see or not see, based only on that video and what we do believe happened. What is apparent to me is that the silhouette effect could have been a factor. And whether (in your opinion) that adds substance to the discussion or not, I couldn’t care less.