I said "saw the gunman" in the window. Okay, James Worrell was right below the 6th floor and when the shooting started he looked up and saw the gun barrel sticking out, Amos Euins looked up and watched the gunman as he was shooting, Howard Brennan saw the gunman, as well, as the shooting took place. Brennan at first said he couldn't id Oswald but later said that he could have id'd Oswald and that he had just been scared to id him. I already know some of the names you are going to cite John. Did any of them see this second man shooting? The importance of this is that witnesses saw the gunman in the 6th floor window and with the mountain of evidence against Oswald it is clear he did it.
Did any of them see this second man shooting? If there was a second man, why does it even matter if he was shooting or not? Do you really think that if somebody is standing next to a gun man who is killing somebody is just an innocent bystander?
The importance of this is that witnesses saw the gunman in the 6th floor window and with the mountain of evidence against Oswald it is clear he did it. First of all, this is a massive leap of faith. The only person who actually claimed he saw Oswald, and not somebody else, at the 6th floor window is Brennan and there are too many problems with his story to be credible on it's own.
Secondly, there is no mountain of evidence against Oswald. I know LNs like to throw that expression about, but in reality all these massive investigations have ever brought up, especially in the murder of Kennedy, is a circumstantial case against Oswald and a very weak one at that.