Kook strategy #26... When you're up against it with no way out, change the argument to the color of the jacket versus the fact that it was a jacket, regardless of the color.
BS. If it wasn't a grey jacket, your entire argument falls apart.
Your fairytale story only works if Oswald left the rooming house, not with any old jacket, but a grey one. Why? Because that grey one was allegedly found under a car in a car park, which in your fantasy world somehow explain why Oswald was (allegedly) seen without a jacket on Jefferson.
You just don't want to talk about the color because it destroys your narrative as Roberts failed to identify the grey jacket belonging to Oswald and said the jacket she had seen (for what that is worth) was darker.
This is just another example of a LN not being willing to look at all the evidence and only concentrating on one part of the evidence (a very weak part) in a pathetic attempt to score a point.