If there’s a 2nd shooter that is responsible for JC getting hit just almost 0.5 sec after JFK , then the angle required to get past the right shoulder or over right shoulder of JFK kind of suggests the SW 6th floor window of TSBD, coincidentally where Arnold Rowland saw a gunman with rifle with large scope standing for a few seconds at 12:15 pm.
The fact that Rowland could see the scope at the distance of something like 240 ft away suggest the rifle he saw was NOT an MC rifle with a side mounted scope, but was quite possibly a rifle like a hunting rifle with a center mounted scope just like Rowland himself thought it looked like to him.
This would be 2 shooters on the 6th floor which is more complicated scenario than just 1 shooter with semi auto rifle.
But it could be the plan, considering that John
Martino supposedly confessed to wife about being tasked with paying TWO assassins.
It’s seems doubtful though that Harold Norman would have heard the loudness of all 3 shots equally , if one of the shooters was at the SW window.